mastoid Hear it!

mastoid definition

mas·toid (mas′to̵id′)

adjective

  1. shaped like a breast or nipple
  2. designating, of, or near a projection of the temporal bone behind the ear

Etymology: Gr mastoeidēs < mastos, a breast (see mast) + -eidēs, -oid

noun

  1. the mastoid projection
  2. Informal mastoiditis

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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