irrotationaladj.
/ɪrəʊˈteɪʃənəl/ Dynamics.
Not rotational; characterized by absence of rotation: said of fluid motion in which each elementary or infinitesimal part of the fluid has no rotation about its own axis.
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irrotational1875
1875 Clerk Maxwell in Encycl. Brit. III. 44/1 The motion of a fluid is said to be irrotational when it is such that if a spherical portion of the fluid were suddenly solidified, the solid sphere so formed would not be rotating about any axis.
1880 G. H. Darwin in Nature 3 June 95/2 Two vortices exercise very remarkable influences on one another, which are due to the irrotational motion of the parts of the fluid outside the vortices.
1883 O. Lodge in Nature XXVII. 330/1 Portions [of ether] either at rest or in simple irrotational motion.
Derivatives
irroˈtationally adv.
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irrotationally1881
1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) I. 117 A vector which is distributed irrotationally in all cases of electric equilibrium.
1881 Nature 17 Mar. 475/2 A mass of fluid revolving irrotationally inside an imperfectly elastic cylindrical case.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2018).
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adj.1875