from
The Collaborative International Dictionary of English v.0.48
dropper \drop"per\, n.
1. One who, or that which, drops. Specif.: (Fishing) A fly
that drops from the leader above the bob or end fly.
[1913 Webster]
2. A dropping tube, usually of glass or plastic with a narrow
opening at the tip and a rubber bulb at the top which can
be squeezed to control intake or outflow of the fluid. The
word is used in combinations with obvious significance, as
{eye dropper}, {medicine dropper}, etc.
Syn: eye dropper. [1913 Webster +PJC]
3. (Mining) A branch vein which drops off from, or leaves,
the main lode.
[1913 Webster]
4. (Zool.) A dog which suddenly drops upon the ground when it
sights game, -- formerly a common, and still an
occasional, habit of the setter.
[1913 Webster]