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helicotrema

(hĕl′ĭ-kō-trēmə)
n.
  1. An opening at the apex of the cochlea that connects the vestibular canal and the scala tympani.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.