Origin of irrotational
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for irrotational
A stream line is the line, straight or curved, traced by a particle in a current of fluid in irrotational movement.
A second-order effect on direction may therefore be produced by irrotational motion, but not a first-order effect.The Ether of Space
It is important to distinguish between two types of strain: the “rotational” type and the “irrotational” type.