calcar

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cal·car 1

 (kăl′kär′)
n. pl. cal·car·i·a (kăl-kâr′ē-ə)
A spur or spurlike projection, such as one found on the base of a petal or on the wing or leg of a bird.

[Latin, spur, from calx, calc-, heel.]

cal·car 2

 (kăl′kär′)
n.
A furnace formerly used in glassmaking for calcination of materials into frit.

[Italian calcara, from Late Latin calcāria (fornāx), lime(-kiln), from Latin, feminine of calcārius, of lime; see calcareous.]
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.

calcar

(ˈkælˌkɑː)
n, pl calcaria (kælˈkɛərɪə)
(Biology) a spur or spurlike process, as on the leg of a bird or the corolla of a flower
[C19: from Latin, from calx heel]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

cal•car

(ˈkæl kɑr)

n., pl. cal•car•i•a (kælˈkɛər i ə)
Biol.
a spur or spurlike process.
[< Latin: spur]
cal′ca•rate`, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.