[ trahy-muh ]
/ ˈtraɪ mə /
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noun, plural try·ma·ta [trahy-muh-tuh]. /ˈtraɪ mə tə/. Botany.
a nut having an outer shell that becomes tough and dry and eventually splits open, as in the walnut and hickory.
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Origin of tryma

1855–60; <New Latin <Greek trŷma hole, equivalent to trȳ́(ein) to rub down, wear away + -ma noun suffix marking result
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British Dictionary definitions for tryma

/ (ˈtraɪmə) /

noun plural -mata (-mətə)
botany a drupe produced by the walnut and similar plants, in which the endocarp is a hard shell and the epicarp is dehiscent

Word Origin for tryma

C19: from New Latin, from Greek truma a hole (referring to the hollow drupe), from truein to wear away
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012