Definition of pterostigma in English:

pterostigma

noun

Entomology
  • A pigmented spot on the anterior margin of the wings of certain insects that is denser than the surrounding (typically transparent) parts of the wing and influences the motion of the wing membrane during flight.

Origin

Mid 19th century. From ptero- + stigma.

Pronunciation

pterostigma

/ˌtɛrəˈstɪɡmə/