‖Tec′ti‐bran′chi‐a″ta (?), n. pl. [NL., fr. L. tectus (p. p. of tegere to cover) + Gr. � a gill.] (Zoöl.) An order, or suborder, of gastropod Mollusca in which the gills are usually situated on one side of the back, and protected by a fold of the mantle. When there is a shell, it is usually thin and delicate and often rudimentary. The aplysias and the bubble shells are examples.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.