单词	gill slit
释义	gill slit noun 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 Example Sentences Recent Examples on the Web Also like other pygmy seahorses, the African species has only one gill slit on its upper back, instead of two below each side of the head, like larger seahorses—another mystery. National Geographic, 20 May 2020 But to breathe, most pull oxygen-containing water into their mouths and pump it through their gill chambers before expelling it out of their gill slits. Alex Fox, Science | AAAS, 14 June 2019 Word History First Known Use 1854, in the meaning defined at sense 1 Medical Definition gill slit noun : 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
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