
1) Cirrostratus cloud 2) Cloud
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https://www.crosswordclues.com/clue/cirrostratus

Cirrus clouds with a flat sheetlike appearance.
Found on
http://ggweather.com/glossary.htm

(Cs) A principal high-level cloud type (cloud genus), appearing as a transparent, whitish cloud veil of fibrous (hair-like) or smooth appearance, totally or partially covering the sky, and often producing halo phenomena, either partial or complete.
Found on
http://nsidc.org/arcticmet/glossary/cirrostratus.html

(from the article `atmosphere`) ...stratus. Advection fog is a stratus cloud with a base lying at Earth`s surface. In the middle troposphere, stratiform clouds are known as ... ...families are divided into three groups on the basis of altitude. High clouds, which are found at mean heights above the ground of 13 to 5 km ... c. Cirrost...
Found on
http://www.britannica.com/eb/a-z/c/87

Cirrus clouds with a flat sheetlike appearance.
Found on
http://www.encyclo.co.uk/local/22268

A principal cloud type featuring cirrus clouds with a flat or sheet-like appearance.
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http://www.stormfax.com/wxwords.htm

[
n] - a thin uniform layer of hazy cloud at high altitude
Found on
http://www.webdictionary.co.uk/definition.php?query=cirrostratus

a principal high-level cloud type (cloud genus), appearing as a transparent, whitish cloud veil of fibrous (hair-like) or smooth appearance, totally or partially covering the sky, and often producing halo phenomena, either partial or complete.
Found on
https://nsidc.org/cryosphere/glossary?page=3
cirrostratus cloud noun a thin uniform layer of hazy cloud at high altitude
Found on
https://www.encyclo.co.uk/local/20974

a cloud of a class characterized by a composition of ice crystals and often by the production of halo phenomena and appearing as a whitish and usually somewhat fibrous veil, often covering the whole sky and sometimes so thin as to be hardly discernible: of high altitude, ab. 20,000–40,000 ft. (6000–12,000 m).
Found on
https://www.infoplease.com/dictionary/cirrostratus
No exact match found.