Etymology
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eyehole (n.)

also eye-hole, 1630s, "cavity or socket containing the orbit of the eye," from eye (n.) + hole (n.). By 1856 as "hole or opening, as in a mask or in a curtain or door, through which one may look, a peep hole."  

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Definitions of eyehole

eyehole (n.)
a hole (in a door or an oven etc) through which you can peep;
Synonyms: peephole / spyhole
eyehole (n.)
a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord or hook or bar;
Synonyms: eyelet
From wordnet.princeton.edu