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noun Tectibranchiata 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.
Collaborative International Dictionary of English 0.48
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