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1. Western US A deep gulch or ravine with sloping sides, often dry in summer.
2. Louisiana & Southern Mississippi
a. A streambed, often dry according to the season.
b. A small stream, bayou, or canal.
3. Upper Midwest A valley with hills on either side.
a. A stream of molten lava.
b. A sheet of solidified lava.

[Canadian French coulée, from French, flow, from couler, to flow, from Latin cōlāre, to filter, from cōlum, sieve.]


(ˈkuːleɪ; -lɪ)
1. (Geological Science)
a. a flow of molten lava
b. such lava when solidified
2. (Physical Geography) Western US and Canadian a dry stream valley, esp a long steep-sided gorge or ravine that once carried melt water from a glacier
3. (Physical Geography) a small intermittent stream in such a ravine
[C19: from Canadian French coulée a flow, from French, from couler to flow, from Latin cōlāre to sift, purify; see colander]


(ˈku li)

1. Chiefly Western U.S. and Western Canada. a deep ravine or gulch, usu. dry, that has been formed by running water.
2. a small valley.
3. a small intermittent stream.
[1800–10, Amer.; < Canadian French, French: a flowing, n. use of fem of coulé, past participle of couler to flow < Latin cōlāre to filter, strain, derivative of cōlum strainer]