Home › Words › E › eyedropperfuleyedropperfuleyedropperful means as much as an eyedropper holds.EtymologyFrom eyedropper + -ful.nounAs much as an eyedropper holds.e.g.“In the hood try holding the stopper from a bottle of concentrated HCl over a watch glass in which you have put an eyedropperful of pyridine.” — 1991, Gary Wulfsberg, Principles Of Descriptive Inorganic Chemistry, page 424:Definitions & examples from Wiktionary (CC BY-SA 3.0).