Crossword Genius

Imperceptible by the eye (9)

Ross

I believe the answer is:

invisible

'imperceptible by the eye' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for invisible that I've seen before include "Impossible to see" , "Writer of unseen words?" , "Out of sight" , "Hidden - imperceptible" , "Not able to be seen" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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