definition of precursor
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precursor Definition of precursor. 1  1a : one that precedes and indicates the approach of anotherb : predecessor. 2  2 : a substance, cell, or cellular component from which another substance, cell, or cellular component is formed.
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What is Cholesterol? Cholesterol as a precursor. Cholesterol is a major precursor in the synthesis of vitamin D, steroid hormones and sex hormones. Examples of the various steroid hormones include corticosteroids such as aldosterone (a mineralcorticoid), cortisol (a glucocorticoid) and cortisone.
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- Definition of pre-. 1a (1) : earlier than : prior to : before Precambrian prehistoric (2) : preparatory or prerequisite to premedicalb : in advance : beforehand precancel prepay. 2 : in front of : anterior to preaxial premolar. preadmission. preadult. preagricultural. preanesthetic.
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ancestor a person from whom one is descended; forebear; progenitor. 2. Biology. the actual or hypothetical form or stock from which an organism has developed or descended. 3. an object, idea, style, or occurrence serving as a prototype, forerunner, or inspiration to a later one:
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Precursor cell In cytology, a precursor cell, also called a blast cell or simply blast, is a type of partially differentiated, usually unipotent cell that has lost most or all of the stem cell multipotency.Usually a precursor cell is a stem cell which has the capacity to differentiate into only one cell types.Sometimes precursor cell is used as an alternative term for unipotent stem cells. A blastoma is a type of cancer created by malignancies of precursor cells.In embryology, precursor cells are a group of cells that differentiate later into one organ.ometimes precursor cell is used as an alternative term for unipotent stem cells. A blastoma is a type of cancer created by malignancies of precursor cells. In embryology, precursor cells are a group of cells that differentiate later into one organ.
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harbinger precursor - something that precedes and indicates the approach of something or someone. harbinger, herald, predecessor, forerunner. indicant, indication - something that serves to indicate or suggest; an indication of foul play; indications of strain; symptoms are the prime indicants of disease.
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- From Wikipedia, the free encyclopedia. In chemistry, a precursor is a compound that participates in the chemical reaction that produces another compound. In biochemistry, the term precursor is used more specifically to refer to a chemical compound preceding another in a metabolic pathway.aman spectroscopy has been successfully tested to detect explosives and their precursors. A portable, advanced sensor based on infrared spectroscopy in a hollow fiber matched to a silicon-micromachined fast gas chromatography column can analyze illegal stimulants and precursors with nanogram-level sensitivity.
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20 Habits Skinny People Live By Develop healthy habits, stick to them, and no matter what nutritional blunders you might make, you'll still keep yourself on the road to weight loss and a slim and sexy physique. Following are the 20 best fat-fighting habits known to man. Commit them to your daily routine and you're guaranteed to drop excess pounds.
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premature pre·ma·ture. (prē′mə-tyo͝or′, -to͝or′, -cho͝or′) adj. 1. Occurring, growing, or existing before the customary, correct, or assigned time; uncommonly or unexpectedly early: a premature end. 2. Born after a gestation period of less than the normal time: a premature infant.
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precursor 3. a chemical that is transformed into another compound, as in the course of a chemical reaction, and therefore precedes that compound in the synthetic pathway: Cholesterol is a precursor of testosterone. 4. a cell or tissue that gives rise to a variant, specialized, or more mature form. pre•cur′so•ry, adj.recursor. n. 1. a person or thing that precedes and shows or announces someone or something to come; harbinger. 2. a predecessor or forerunner. 3. (Chemistry) a chemical substance that gives rise to another more important substance.
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- antecedent noun [C usually pl]. › something ​existing or ​happening before, esp. as the ​cause of an ​event or ​situation: The ​book ​dealt with the ​historical antecedents of the Civil War.
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- precursornoun [ C ] uk ​ /ˌpriːˈkɜː.sər/ us ​ /ˌpriːˈkɝː.sɚ/ formal. › something that happened or existed before another thing, especially if it either developed into it or had an influence on it: Sulphur dioxide is the main precursor of acid rain. Biological research has often been a precursor to medical breakthroughs.
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harbinger predecessor - something that precedes and indicates the approach of something or someone. harbinger, herald, forerunner, precursor. indicant, indication - something that serves to indicate or suggest; an indication of foul play; indications of strain; symptoms are the prime indicants of disease.
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- Definitions for premonitoryprɪˈmɒn ɪˌtɔr i, -ˌtoʊr i. Here are all the possible meanings and translations of the word premonitory. Princeton's WordNet(0.00 / 0 votes)Rate this definition: precursory, premonitory(adj) warning of future misfortune.
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prequel A book, episode, etc, that precedes an existing work in time •Not very precisely differentiated from flashback: what Hollywood calls a ''prequel,'' an adventure that takes place at the start of his career.
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Prequel A prequel is a literary, dramatic, or filmic work whose story precedes that of a previous work, by focusing on events that occur before the original narrative. A prequel is a work that forms part of a backstory to the preceding work. All prequels are, by definition, essentially sequels in that they expand on a previous or preceding work. The term is a 20th-century neologism that is a portmanteau of the prefix pre- (from Latin prae, before) and sequel.
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preliminary preceding and leading up to the main part, matter, or business; introductory; preparatory: preliminary examinations. noun, plural preliminaries. 2. something preliminary, as an introductory or preparatory step, measure, contest, etc.: He passed the preliminary and went on to the finals.
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- 2 something belonging to an earlier time from which something else was later developed the typewriter is the antecedent of the computer keyboard Synonyms ancestor, archetype, daddy, foregoer, forerunner, granddaddy (also grandaddy), precursor, predecessor, prototypeRelated Words model, original; originator, sire; father, motherNear Antonyms ...
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contributor Contributor definition, a person who contributes money, assistance, etc. See more.
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source origin, source, inception, root mean the point at which something begins its course or existence. origin applies to the things or persons from which something is ultimately derived and often to the causes operating before the thing itself comes into being an investigation into the origin of baseball. source applies more often to the point where ...
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- Example Sentences for precursor. A beam fell from the roof to the floor, precursor of the rest. Jaime looked upon him as a precursor who cleared away his doubts. A lively caricature, the precursor of Dickens' American Notes.. A formidable Moorish weapon, the precursor of the boarding-pike.
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accession Definition of accession. 1  1a : the act or process by which someone rises to a position of honor or power the accession of a new queen a politician's accession to power Queen Victoria's accession to the throne/crown occurred in 1837.b : an act of coming near or to something : approach, admittance.
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- lineage noun [U]. › biology all the ​living things that are ​related ​directly to the same ​living thing that ​existed ​long ago. (Definition of lineage from the Cambridge Academic Content Dictionary © Cambridge University Press). See all translations.
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- Noun. 1. precursor-a substance from which another substance is formed (especially by a metabolic reaction). biochemistry-the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry.. One that precedes another; a forerunner or predecessor: The new principal's precursor was an eminent educator. 3. A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, from which a more stable or definitive product is formed: a precursor of insulin.
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- Full Definition of LINEAGE. 1. a: descent in a line from a common progenitor b: derivation. 2. : a group of individuals tracing descent from a common ancestor; especially: such a group of persons whose common ancestor is regarded as its founder.
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lineage Lineage is defined as the descendants of a common ancestor. An example of lineage are people who all have the same common relative from 300 years ago. lineage. lineage.