Definition of pseudopupil in English:

pseudopupil

noun

Zoology
  • A spot or structure in the eye that resembles or functions as a pupil; especially a spot seen in the centre of the compound eye of certain insects that appears darker than the surrounding ommatidia (or shines when illuminated), owing to absorption (or reflection) of light along the axes of individual ommatidia.

Origin

Early 20th century; earliest use found in Classical Philology. After German Pseudopupille.