but·​ter·​fli·​er | \ ˈbə-tər-ˌflīr How to pronounce butterflier (audio) , -ˌflī-ər\
plural butterfliers

Definition of butterflier

1 : a person who observes and identifies butterflies in their natural environment Already, like birders, butterfliers are trekking the world in search of ever more exotic species.— Margo Harakas, Houston Chronicle, 24 Apr. 1994
2 : a swimmer who specializes in the butterfly : butterflyer

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First Known Use of butterflier

1881, in the meaning defined at sense 1

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The first known use of butterflier was in 1881

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to affect and impair by alcohol or a drug

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