noun, plural patagia [puh-tey-jee-uh] .
a wing membrane, as of a bat.
the extensible fold of skin of certain insects or of a gliding mammal or reptile, as a flying squirrel.
either of two small processes on the anterior thorax, found especially among butterflies and moths.

1820–30; < Neo-Latin, special use of Latin patagium tunic border Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
patagium (pəˈteɪdʒɪəm)
n , pl -gia
1.  a web of skin between the neck, limbs, and tail in bats and gliding mammals that functions as a wing
2.  a membranous fold of skin connecting margins of a bird's wing to the shoulder
[C19: New Latin from Latin, from Greek patageion gold border on a tunic]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
They do not actually fly, but glide using a membrane called a patagium that extends from their wrists to their ankles.
It is definitely enough for the flying squirrel, whose aerodynamic specialty comes courtesy of a swatch of skin called a patagium.
The patagium extended from the wrist of the foreleg to the ankle of the hind leg.
Wing-tags were secured to the birds with a single rivet attached through the patagium.
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