dropper

 
Pronunciation: /ˈdrɒpə/

noun

  • 1a short glass tube with a rubber bulb at one end and a tiny hole at the other, for measuring out drops of medicine or other liquids: oils sold in bottles with a rubber-tipped dropper an eye dropper
  • 2Australian/NZ & South African a light vertical stave in a fence, especially a lath used to separate the wires of a wire fence.
  • 3 Fishing a subsidiary line or loop of filament attached to a main line or leader: [as modifier]: a dropper line

Origin:

mid 17th century (in the sense 'a person who lets something drop'); dropper (sense 1) is first recorded in the late 19th century