Pronunciation: tet'ra-hi'me-na pir'i-for'mis
A ciliate belonging to a large group characterized by three membranes on one side of the buccal cavity and one on the other; it somewhat resembles the paramecium and, like it, is readily cultured and used extensively for experimental studies.
[tetra- + G. hymen, membrane]
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Examples: glitazone, GI cocktail, etc.