Etymology
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dropper (n.)

1700, "a distiller" (in colloquial rum-dropper), agent noun from drop (v.). Meaning "small tube from which liquid may be made to fall in drops" is by 1889.

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Definitions of dropper

dropper (n.)
pipet consisting of a small tube with a vacuum bulb at one end for drawing liquid in and releasing it a drop at a time;
she used an eye dropper to administer medication to the eyes
Synonyms: eye dropper
From wordnet.princeton.edu