Definition

The technical term for the membrane of skin that flying squirrels (and sugar gliders, bats, etc.) stretch between their limbs to glide through the air. Not slang at all—this is actual biological terminology that someone inexplicably submitted to Urban Dictionary. Congratulations, you learned real science from a jargon dictionary.

Example Usage

The biology professor explained how the patagium allows flying squirrels to glide up to 150 feet between trees.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=patagium&defid=19372)

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