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Definition of: hypostoma
(hī·pos′tə·mə, hi-) noun plural hy·po·sto·ma·ta (hī′pə·stō′mə·tə) Zool.
A part or organ lying below the mouth, as in certain crustaceans and coelenterates. Also hyp·o·stome (hip′ə·stōm). [<NL <Gk. hypo- under + stoma mouth]
—hy′po·sto′mi·al adjective
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