Wiktionary
hind wings
n. (hind wing English)
Usage examples of "hind wings".
But soon one line of aves had grown too large to escape through the air, and while its light-boned, light-brained cousins ascended ever higher into the sky and pumped their expanding front wings and let the hind wings shrivel into claws, this nether line planted its hind limbs firmly in the dread earth and discarded flight.
There are two sets of wings-durable forewings that resemble the alytron of similar species, and more delicate hind wings folded underneath.