Web
A web was a flap of skin in between one's digits.

Moto, a Starfleet Security officer who served in 's brig in 2259, had webbed hands. ()

In 2269, as a result of the Aquan surgo-op, James T. Kirk and Spock developed webbed hands. ()

Megazoids had webbed feet. In 2293, Crewman  showed his feet to prove that he could not have been the wearer of a pair of magnetic boots used by one of Chancellor Gorkon's assassins. ()

Zaldans had webbed fingers. In 2364, during his entrance examinations, Wesley Crusher recognized Rondon as one, averting a breach of cultural etiquette and successfully passing a deliberate cultural awareness test. ()

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Anatomy