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costard

[kos-terd, kaw-sterd]
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noun
  1. a large English variety of apple.
  2. 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. 2018

British Dictionary definitions for costard

costard

noun
  1. an English variety of apple tree
  2. the large ribbed apple of this tree
  3. archaic, jocular a slang word for head
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Word Origin

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

Word Origin and History for costard

n.

late 13c., coster, perhaps from Anglo-French or Old French coste "rib" (from Latin costa "a rib;" see coast (n.)). A kind of large apple with prominent "ribs," i.e. one having a shape more like a green pepper than a plain, round apple. Also applied derisively to "the head." Common 14c.-17c. but limited to fruit-growers afterward.

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Online Etymology Dictionary, © 2010 Douglas Harper