How many letters does the top answer for “pupil of the eye.” have?

The most common answer is strale (6 letters).

Crossword clue: pupil of the eye.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

strale 6 letters web-def

Pupil of the eye. [Prov. Eng.]

inequality of the pupils of the eye. 67% similar → anisocoria

of or pertaining to the pupil of the eye. 67% similar → pupillary

of or relating to the pupil of the eye 67% similar → pupillary