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branchial cleft

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noun
  1. Zoology. one of a series of slitlike openings in the walls of the pharynx between the branchial arches of fishes and aquatic amphibians through which water passes from the pharynx to the exterior.
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Also called visceral cleft.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

branchial cleft in Medicine

branchial cleft

n.
  1. One of a bilateral series of slitlike openings into the pharynx through which water is drawn by aquatic animals.
  2. Any of the homologous branchialectodermal grooves of the mammalian embryo.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.