Definition of dropper noun from the Oxford Advanced Learner's Dictionary

 

dropper

 noun
noun
BrE BrE//ˈdrɒpə(r)//
 
; NAmE NAmE//ˈdrɑːpər//
 
 
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a short glass tube with a hollow rubber end used for measuring medicine or other liquids in drops an eye dropper Word Origin mid 17th cent. (in the sense ‘a person who lets something drop’); the current sense is first recorded in the late 19th cent.
See the Oxford Advanced American Dictionary entry: dropper