from The American Heritage® Dictionary of the English Language, 4th Edition
- Below; beneath; under: hypodermic.
- Less than normal; deficient: hypoesthesia.
- In the lowest state of oxidation: hypoxanthine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Below; beneath; under.
- Deficient; less than normal.
- A name for oxoacid and oxyanions with a low amount of oxygen.
from the GNU version of the Collaborative International Dictionary of English
- A prefix signifying a less quantity, or a low state or degree, of that denoted by the word with which it is joined, or position under or beneath.
- A prefix denoting that the element to the name of which it is prefixed enters with a low valence, or in a low state of oxidization, usually the lowest, into the compounds indicated.
Greek hupo-, from hupo, under, beneath; see upo in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ὑπο- (hypo-), combining form of ὑπό (hypó, "under"). Compare sub-. (Wiktionary)