isokinetic line

in atmospheric chemistry
https://doi.org/10.1351/goldbook.I03284
A line in a given surface connecting points with equal wind speed; also called isotach or isovel.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2198 (https://doi.org/10.1351/pac199062112167)