strati

strati-

a combining form representing stratum, in compound words: stratiform.

Origin:
strat(um) + -i-

Dictionary.com Unabridged

stratus

[strey-tuhs, strat-uhs]
noun, plural strati [strey-tahy, strat-ahy] .
a cloud of a class characterized by a gray, horizontal layer with a uniform base, found at a lower altitude than altostratus, usually below 8000 feet (2400 meters).

Origin:
1795–1805; < Latin strātus; see stratum

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
strati-
 
combining form
indicating stratum or strata: stratiform; stratigraphy

stratus (ˈstreɪtəs)
 
n , pl -ti
cirrus Compare cumulus a grey layer cloud
 
[C19: via New Latin from Latin: strewn, from sternere to extend]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

stratus
"a low layer of cloud," 1803, from L. stratus "a spreading," from stratus, pp. of sternere (see stratum).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
stratus   (strāt'əs, strā'təs)  Pronunciation Key 
Plural strati (strāt'ī, strā'tī)
A diffuse, grayish cloud that often produces drizzle and is formed primarily in altitudes no higher than 2,000 m (6,560 ft). A stratus cloud close to the ground or water is called fog. See illustration at cloud.
The American Heritage® Science Dictionary
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