Having two pupil-like structures or markings, often used in entomology and botany to describe eyes, flowers, or other biological structures with two eye-like spots.
From bi- (two) + pupillate (from Latin pupilla, a small doll or eye, originally referring to the pupil's reflection). This is a specialized biological term.
Butterfly wings often have 'bipupillate' eyespots (two eye-like markings) that scare away predators—this terminology matters because having exactly two eyelike spots looks different to a predator than having four, affecting whether it's an effective defense.
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