inviscid

adjective
in·vis·cid | \(ˌ)in-ˈvi-səd \

Definition of inviscid 

1 : having zero viscosity

2 : of or relating to an inviscid fluid inviscid flow

First Known Use of inviscid

circa 1889, in the meaning defined at sense 1

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The first known use of inviscid was circa 1889

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