• Webster's Revised Unabridged Dictionary
    • n. pl Holostomata (Zoöl) An artificial division of gastropods, including those that have an entire aperture.
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Century Dictionary and Cyclopedia
    • holostomata A division of pectinibranchiate gastropodous mollusks, with shells having the mouth entire, and not notched or prolonged into a siphon: opposed to Siphonostomata. It was framed to include such families as Turbinidæ, Neritidæ, Littorinidæ, etc., now referred to different orders. Some are known as sea-snails. There are upward of 12 families, even after eliminating some, as the chitons and tooth-shells, that used to be included. These families are mostly tænioglossate, but some, as the Ianthinidæ and Scalariidæ, are ptenoglossate.
    • holostomata In Infusoria, same as Pantostomata.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. "o`los whole + sto`ma -atos, mouth