Definify.com
Webster 1913 Edition
Hypo-
Hy′po-
.[Gr. [GREEK] under, beneath; akin to L.
sub
. See Sub-
.] 1.
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.
2.
(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;
as,
. hypo
sulphurous acid