Answer: alulae

AnswerCrossword Clue
ALULAE"Thumbs" of birds' wings
ALULAESpurious wings.
ALULAEBird feathers
ALULAEBirds' "thumbs"
alulaethe process of a bird's wing corresponding to the thumb and bearing a few short quills called also bastard wing
alulaethe group of three to six small, rather stiff feathers growing on the first digit, pollex, or thumb of a bird's wing
alulaemembranous lobe at the base of each wing of a dipterous insect