isotach

[ ahy-suh-tak ]
/ ˈaɪ səˌtæk /

noun Meteorology.

a line on a weather map or chart connecting points where winds of equal speeds have been recorded.

Origin of isotach

1945–50; iso- + -tach < Greek tachýs swift; see tachy-

British Dictionary definitions for isotach

isotach
/ (ˈaɪsəʊˌtæk) /

noun

a line on a map connecting points of equal wind speed

Word Origin for isotach

from iso- + Greek takhos speed