os 1

os 1 definition - medical

os 1 (ŏs)

noun pl. o·ra (ôrˈə)
  1. An opening into a hollow organ or canal.
  2. The oral cavity; mouth.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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