Definition of elfin adjective from the Oxford Advanced Learner's Dictionary

 

elfin

 adjective
adjective
BrE BrE//ˈelfɪn//
 
; NAmE NAmE//ˈelfɪn//
 
 
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(of a person or their features) small and delicate an elfin face Word Origin late 16th cent.: from elf, probably suggested by Middle English elvene ‘of elves’, and by Elphin, the name of a character in Arthurian romance.
See the Oxford Advanced American Dictionary entry: elfin