A lot vs. Alot: 9 Grammatical Pitfalls
1700, "distiller," agent noun from drop (v.). Meaning "small tube from which liquid may be made to fall in drops" is from 1889.
dropper drop·per (drŏp'ər)n. 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.