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costard

[ kos-terd, kaw-sterd ]
/ ˈkɒs tərd, ˈkɔ stərd /
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noun

a large English variety of apple.
Archaic. the head.

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Origin of costard

1250–1300; Middle English, perhaps <Anglo-French, equivalent to coste rib (see coast) + -ard-ard, alluding to the ridges or ribs of the variety
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for costard

costard
/ (ˈkʌstəd) /

noun

an English variety of apple tree
the large ribbed apple of this tree
archaic, jocular a slang word for head
C14: from Anglo-Norman, from Old French coste rib
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
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