(hī′pō) noun
1. Chem. Sodium thiosulfate.
2. Slang Hypochondria; also, a hypochondriac.
3. Colloq. A hypodermic injection or needle.

1. Under; beneath; less than: hypodermic: opposed to hyper–.
2. Chem. Indicating the lowest member in a series of compounds, that is, the lowest degree of oxidation: hypophosphate.
3. Med. Denoting a lack of or deficiency in: hypofunction. Also, before vowels, hyp–. [<Gk. hypo- <hypo under]