cloud base

noun
variants: or less commonly cloudbase \ ˈklau̇d-​ˌbās \
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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First Known Use of cloud base

1891, in the meaning defined above

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The first known use of cloud base was in 1891

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