‖Si′pho‐no‐bran′chi‐a″ta (?), n. pl. [NL. See Siphon, and Branchia.] (Zoöl.) A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.