[1] : WordNet (r) 2.0

nimbus cloud
     n : a dark gray cloud bearing rain syn: nimbus, rain cloud
see also:
nimbus rain cloud 

Nimbus >> N Words
Nimbus, definition of term: Nimbus
nimbus_pag1.html

Cloud >> C Words
Cloud, definition of term: Cloud
cloud_pag1.html

Cloud Nine >> C Words
Cloud Nine, definition of term: Cloud Nine
cloud+nine_pag1.html

Cloud Chamber >> C Words
Cloud Chamber, definition of term: Cloud Chamber
cloud+chamber_pag1.html

White Cloud >> W Words
White Cloud, definition of term: White Cloud
white+cloud_pag1.html

Oort Cloud >> O Words
Oort Cloud, definition of term: Oort Cloud
oort+cloud_pag1.html