Dictionary![]() ![]() pa•ta•gi•umPronunciation: (pu-tā'jē-um), [key] —n., —pl. -gi•aPronunciation: (-jē-u). [key] 1. a wing membrane, as of a bat. 2. the extensible fold of skin of certain insects or of a gliding mammal or reptile, as a flying squirrel. 3. either of two small processes on the anterior thorax, found esp. among butterflies and moths. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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