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  1. Oxford American Dictionary

    gill slit

    • IPA[ˈɡil ˌslit]

    美式

    • n.
      any of a series of openings between the gill arches of a fish, through which water passes from the pharynx to the exterior, bathing the gills in the process.；a set of grooves similar to gill slits found in embryos of higher vertebrates.

    • noun: gill slit, plural noun: gill slits