ostium Hear it!

ostium definition

os·tium (äs′tē əm)

noun pl. ostia -·tia (-ə)

Anat. an opening or orifice

Etymology: L ostium: see ostiary

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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