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spectator one that watches or observes. [2 definitions]
spectra a pl. of spectrum.
spectro- spectrum.
spectrogram a graphic representation or photograph of a spectrum.
speculate to wonder or make a guess or guesses with respect to something. [5 definitions]
speculation the act or process of thinking, wondering, or guessing about something. [4 definitions]
speculative of, pertaining to, or based on conjecture or theorizing. [4 definitions]
speculator one that engages in financial speculations. [2 definitions]
speculum a medical instrument that can be opened after insertion, used to dilate a passage or cavity so that it can be examined. [3 definitions]
sped a past tense and past participle of speed.
speech the faculty of communicating by speaking, or the act of speaking. [7 definitions]
speech clinic a facility where people with speech defects are treated.