Hy`dro*bran`chi*a"ta (?), n. pl. [NL., fr. Gr. "y`dwr water + gills.] Zool.
An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera.
--
Hy`dro*bran"chi*ate (#), a.
© Webster 1913.