Dropper

Part of speech: noun (n.)

1. One who, or that which, drops. Specif.: (Fishing) A fly that drops from the leaden above the bob or end fly.

2. A dropping tube.

3. A branch vein which drops off from, or leaves, the main lode.

4. A dog which suddenly drops upon the ground when it sights game, -- formerly a common, and still an occasional, habit of the setter.