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Entry 1 sense Webster, 1913

Siphonostomatous

· Si·pho·no·stom·a·tous · IPA
01 a. Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain…
  1. 1.
    Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.(Zool.)