drop·per 
/ˈdrɑ:pɚ/ noun
plural drop·pers /ˈdrɑ:pɚ/ noun [count] : a glass or plastic tube that is used to measure out liquids by drops
▪ He put drops in his eyes with a dropper. —called also eyedropper, medicine dropper
▪ He put drops in his eyes with a dropper. —called also eyedropper, medicine dropper
