Low, under, beneath, down, or below normal.
This topic provides information about hypothyroidism. Hypothyroidism means your thyroid is not making enough thyroid hormone. If you are looking for information about when the thyroid makes too much thyroid hormone, see the topic Hyperthyroidism. Hypothyroidism means your thyroid is not making enough thyroid hormone. The thyroid is a butterfly-shaped gland in the front of your neck. It makes hormones that control the way your body uses energy. Having a low level of thyroid hormone affects your whole body. hypo (hī´pō) , n an abbreviated form of the term hyposulfite, which is a synonym of sodium thiosulfate (Na2S2O3), a solution used in photography and radiography to fix and harden the manifest image. See also fixation. Hypo-: Prefix meaning low, under, beneath, down, or below normal, as in hypoglycemia (low blood sugar) and hyposensitivity (undersensitivity). The opposite of hypo-is hyper-. A hypo is when your blood glucose levels go too low. Hypo, in diabetes, is short for hypoglycemia-meaning low glucose in the blood. Hypos are most likely to happen with people taking insulin. The warning signs of a hypo can include: 1  Feeling very hungry. 2  Sweating.
http://www.webmd.com/women/tc/hypothyroidism-topic-overview http://medical-dictionary.thefreedictionary.com/hypo http://www.medicinenet.com/script/main/art.asp?articlekey=3854 http://www.diabetes.co.uk/what-is-a-hypo.html
what is a hypo