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.
  • (Chem.) 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • prefix anatomy Below; beneath; under.
  • prefix medicine Deficient; less than normal.
  • prefix chemistry A name for oxoacid and oxyanions with a low amount of oxygen.


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ὑπο- (hypo-), combining form of ὑπό (hypó, "under"). Compare sub-.



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