irrotational

adjective
ir·ro·ta·tion·al | \ˌir-(r)ō-ˈtā-shnəl, -shə-nᵊl\

Definition of irrotational 

1 : not rotating or involving rotation

2 : free of vortices irrotational flow

First Known Use of irrotational

1875, in the meaning defined at sense 1

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The first known use of irrotational was in 1875

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