n. A principal, low-level cloud type in the form of a gray layer with a rather uniform base, usually not associated with precipitation, and capable of producing corona phenomena and a weak, uniform luminance; abbreviated St.
the GNU version of the Collaborative International Dictionary of English
n. A form of clouds in which they are arranged in a horizontal band or layer. See cloud.
The Century Dictionary and Cyclopedia
n. A continuous horizontal sheet of cloud, generally of uniform thickness.
n. See cloud, 1.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a large dark low cloud
Word Usage
"Most likely, it was one of the 10 great species of clouds, beginning with low- altitude cumulus ("cotton-wool puffs"), stratocumulus ("a low layer or patch of cloud") and stratus (a "gray overcast layer")."