costard

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

noun

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

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. 2019

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

Word Origin for costard

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