What is the meaning of Alula?

A small projection of three or four feathers on the first digit of the wing on some birds.

A flower, a species of Hawaiian lobelioid

alula

alula (feather)

bastard wing, alula

alula, axillary lobe (broad lobe at the proximal posterior margin of the wing stalk of Diptera)

leading-edge slot (aerodynamic feature of an aircraft's wing)

Source: wiktionary.org