isotach

isotach

[ahy-suh-tak]
noun Meteorology.
a line on a weather map or chart connecting points where winds of equal speeds have been recorded.

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

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World English Dictionary
isotach (ˈaɪsəʊˌtæk)
 
n
a line on a map connecting points of equal wind speed
 
[from iso- + Greek takhos speed]

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