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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British Dictionary definitions for tryma
botany a drupe produced by the walnut and similar plants, in which the endocarp is a hard shell and the epicarp is dehiscent
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