instability line

noun Meteorology.
a nonfrontal line of convective activity in the atmosphere, usually several hundred miles long but of relatively brief duration.
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Instability line is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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There was little evidence in the surface data that a well organized instability line existed.
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