Definition of cloud base
cloud bases
alsocloudbases
: the lower edge of a cloud or cloud system a low cloud base The tools of its trade include a pair of wings that can take it soaring to cloudbase or turn it into a feathered projectile capable of gliding or diving at 95 km/h … — Peter Meredith, Australian Geographic, January–March 1990
From the M-W Editors
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1891
First Known Use of cloud base
1891
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