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From: Webster's Revised Unabridged Dictionary (1913)

 Tec·ti·bran·chi·a·ta n. pl.  Zool. 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.