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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.

Definition 2024

pterostigma

pterostigma

English

Noun

pterostigma ‎(plural pterostigmata)

(zoology) A cell in the outer wing of insects which is often thickened or coloured and so stands out from other cells.
The pterostigma is particularly noticeable in dragonflies.