The Collaborative International Dictionary
Pterostigmata
Pterostigma \Pter`o*stig"ma\, n.; pl. Pterostigmata. [NL., fr. Gr. ? wing + ?, ?, a mark.] (Zo["o]l.) A thickened opaque spot on the wings of certain insects.
Wiktionary
pterostigmata
n. (plural of pterostigma English)