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n. pl. a·can·thae (-thē)
A sharp spiny part or structure, such as the spinous process of a vertebra.
[New Latin, from Greek akantha, thorn.]
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.
a pointed, projecting structure, such as a thorn or prickle
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014