GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Hypo- . [Gr.  under, beneath; akin to L. sub. See Sub-.]
   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.
   1913 Webster
   (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, hyposulphurous acid.
   1913 Webster