dropper
/ˈdrɒpə(r)/noun
1
- a 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滴管。
2
- Austral./NZ & S. African a light vertical stave in a fence, especially a lath used to separate the wires of a wire fence〈澳/新西兰, 南非〉（篱笆的）直板条（尤指用以分隔铁丝网之铁丝的板条）。
3
- Fishing a subsidiary line or loop of filament attached to a main line or leader【渔】（钓鱼线或接钩绳上的）辅助线（或线圈）。
词源
mid 17th cent. （in the sense 'a person who lets something drop'）; sense 1 is first recorded in the late 19th cent.