WordNet
nimbus cloud
n. a dark gray cloud bearing rain [syn: nimbus, rain cloud]
Usage examples of "nimbus cloud".
Jan recalled the way that he had been on Earth, with his talk of strato-cumulus and cumulo-nimbus cloud layers.
At lower levels, rising pockets of heat from the built-up areas bumped the- aeroplane about like a iuppet, and to enormous heights great heaps of cumulo-nimbus cloud were boiling up all round the horizon.