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Webster 1913 Edition

Pterostigma

‖

Pterˊo-stig′ma

,

Noun.

;

pl.

Pterostigmata

(#)

.

[NL., fr. Gr. [GREEK] wing + [GREEK], [GREEK], a mark.]

(Zool.)

A thickened opaque spot on the wings of certain insects.