Gill cleft | definition of gill cleft by Medical dictionary
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gill cleft or
gill slit an inpushing of the epidermis in the region of the GILLS in developing CHORDATE embryos including humans. The gill clefts normally meet similar outpushings from the endoderm of the pharynx, and in fish and occasionally in terrestrial vertebrates such as amphibians, break through to the exterior to form the gill slits.