Etymology
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hypo (n.)

1711, "depression of the spirits," short for hypochondria; 1904 as short for hypodermic needle.

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Definitions of hypo

hypo (n.)
a compound used as a fixing agent in photographic developing;
Synonyms: sodium thiosulphate / sodium thiosulfate
hypo (n.)
a piston syringe that is fitted with a hypodermic needle for giving injections;
Synonyms: hypodermic syringe / hypodermic
From wordnet.princeton.edu