cloud base
noun
variants
or less commonly cloudbase
plural cloud bases also cloudbases
: 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
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Merriam-Webster unabridged
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