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inviscid

[in-vis-id] /ɪnˈvɪs ɪd/
adjective
1.
(of a fluid) having no viscosity.
Also, nonviscous.
Origin of inviscid
1910-1915
1910-15; in-3 + viscid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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