gill cleft is a noun meaning "one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes". It carries one recorded sense.
one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes
Definitions, synonyms and semantic relations for gill cleft come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.