This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or belonging to the Diptera, a large order of insects that includes the true flies and mosquitoes, characterized by a single pair of membranous wings and a pair of club-shaped balancing organs.

adj. Having two wings, as certain insects, or winglike appendages, as certain fruits and seeds: the dipterous fruit of the maple.

adj. Of, or pertaining to, Diptera.

adj. Having two wings, as certain insects; belonging to the order Diptera.

adj. Having two wings; two-winged.

In entomology, having two wings; specifically, pertaining to or having the characters of the order Diptera (which see).

2. In botany, having two wing-like membranous appendages; bialate: applied to stems, fruits, seeds, etc.

adj. of or relating to or belonging to the Diptera

"For the very reason of their being dipterous is that they are small and weak, and therefore require no more than two feathers to support their light weight; and the same reason which reduces their feathers to two causes their sting to be in front; for their strength is not sufficient to allow them to strike efficiently with the hinder part of the body."

two-winged