- In protozoology, usually termed test; an envelope of certain forms of ameboid protozoa, consisting of various earthy materials cemented to a chitinous base (as in the testate rhizopods of the subclass Testacealobosia) or the calcareous, siliceous, organic, or strontium sulfate skeletons in the rhizopod subclass Foraminifera.
- In botany, the outer, sometimes the only, coat of a seed.
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Examples: glitazone, GI cocktail, etc.