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The Collaborative International Dictionary
Siphonostomatous

Siphonostomatous \Si`pho*no*stom"a*tous\, a. (Zo["o]l.)

  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.

  2. Pertaining to the Siphonostomata.

Wiktionary
siphonostomatous

a. 1 (context zoology English) Having the front edge of the aperture of the shell lengthened in the shape of a channel for the protection of the siphon; said of certain gastropods. 2 (context zoology English) Pertaining to the Siphonostomata.