isobront

[ ahy-suh-bront ]

/ ˈaɪ səˌbrɒnt /

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noun Meteorology.

a line on a weather map or chart connecting various points where a given phase of thunderstorm activity occurred simultaneously.

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The rainy weather could not ________ my elated spirits on my graduation day.

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Origin of isobront

1885–90; iso- + -bront<Greek brontḗ thunder

Isobront, ī′so-bront, n. a line on a map connecting points at which a peal of thunder is heard simultaneously.
Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)|Various