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stratus (n.)

"a low layer of cloud," 1803, from Latin stratus "a spreading," from noun use of past participle of sternere "to spread out, lay down, stretch out," from nasalized form of PIE root *stere- "to spread."

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Definitions of stratus from WordNet

stratus (n.)
a large dark low cloud;
Synonyms: stratus cloud
From wordnet.princeton.edu