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tryma

[trahy-muh]
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noun, plural try·ma·ta [trahy-muh-tuh] /ˈtraɪ mə tə/. Botany.
  1. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tryma

tryma

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

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