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1. An English variety of large cooking apple.
2. Archaic The human head.
[Middle English, from Old North French, possibly from coste, rib (from its ribbed appearance), from Latin costa; see kost- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Plants) an English variety of apple tree
2. (Plants) the large ribbed apple of this tree
3. archaic jocular a slang word for head
[C14: from Anglo-Norman, from Old French coste rib]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cos•tard(ˈkɒs tərd, ˈkɔ stərd)
1. a large English variety of apple.
2. Archaic. the head.
[1250–1300; Middle English]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.