Plural form of ectopagium; external wing membranes or fold-like structures in certain animals, particularly bats.
From Greek 'ekto-' (outside) + 'patagia' (wing-like expansions). A technical term in mammalogy describing bat wing anatomy.
Bat wings are covered in a thin skin called the patagium, and the 'ecto-' version refers to the outer membrane—it's so thin you can see blood vessels through it, which helps bats sense air currents!
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