gill slit

noun

Definition of gill slit

1 : any of the openings or clefts between the gill arches in vertebrates that breathe by gills through which water taken in at the mouth passes to the exterior and so bathes the gills

2 : any of the rudimentary grooves in the neck region of the embryos of air-breathing vertebrates that correspond to the gill slits

3 : the external opening to the cavity containing the gills when a protective covering of the gills is present

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The first known use of gill slit was in 1854

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gill slit

noun

Medical Definition of gill slit

: one of the openings or clefts between the gill arches in vertebrates that breathe by gills through which water taken in at the mouth passes to the exterior and bathes the gills also : branchial cleft