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acantha

(ə-kănthə)
n. pl. a•can•thae (-thē)
  1. A sharp spiny part or structure, such as the spinous process of a vertebra.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.