a person or thing that drops.
a glass tube with a hollow rubber bulb at one end and a small opening at the other, for drawing in a liquid and expelling it in drops; medicine dropper.
a short-haired dog that is a cross between a pointer and a setter.

1690–1700; drop + -er1

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World English Dictionary
dropper (ˈdrɒpə)
1.  a small tube having a rubber bulb at one end for drawing up and dispensing drops of liquid
2.  a person or thing that drops
3.  angling a short length of monofilament by which a fly is attached to the main trace or leader above the tail fly
4.  (Austral), (NZ) a batten attached to the top wire of a fence to keep the wires apart

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

dropper drop·per (drŏp'ər)
A device that produces drops, especially a small tube with a suction bulb at one end for drawing in a liquid and releasing it in drops. Also called instillator.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Today she was more than willing to take thin cream of wheat through the dropper.
One used a medicine dropper to add lavender into the beige liquid, while
  another stirred the drops in.
All it takes is two test tubes, some chemicals, a medicine dropper.
If the dropper sinks to the bottom, let some water out of the dropper.
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