Etymology
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eye-drop (n.)

also eyedrop, 1590s, "tear," from eye (n.) + drop (n.). From 1938 as "a drop for the eye." Related: Eye-dropper.

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Definitions of eye-drop

eye-drop (n.)
a drop from an eye dropper;
Synonyms: eyedrop
eye-drop (n.)
a method of irrigating the eye used by ophthalmologists;
Synonyms: eyedrop
From wordnet.princeton.edu