plural cloud bases also cloudbases
Definition of cloud base
: 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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Time Traveler for cloud base
The first known use of cloud base was in 1891
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