‖Hy′dro‐bran′chi‐a″ta (?), n. pl. [NL., fr. Gr. ὕδωρ water + � gills.] (Zoöl.) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. — Hy′dro‐bran″chi‐ate (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.