
1) Altocumulus cloud 2) Cumulus 3) Cumulus cloud
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https://www.crosswordclues.com/clue/altocumulus

Mid-altitude clouds with a cumuliform shape.
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http://ggweather.com/glossary.htm

(Ac) A principal middle level cloud type (cloud genus), white or gray, or both white and gray, which occurs as a layer or patch with a wave aspect, the elements of which appear as laminae, rounded masses, rolls, etc. These elements usually are sharply outlined, but they may become partly fibrous or diffuse; they may or may not be merged; they gener...
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http://nsidc.org/arcticmet/glossary/altocumulus.html

(from the article `cloud`) ...High clouds, which are found at mean heights above the ground of 13 to 5 km (42,500 to 16,500 feet), are cirrus, cirrocumulus, and cirrostratus. ... a. Altocumulus[2 related articles]
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http://www.britannica.com/eb/a-z/a/53

Mid-altitude clouds with a cumuliform shape.
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http://www.encyclo.co.uk/local/22268

Altocumulus is a cloud formation at between 10000 and 25000 feet, made up of many patches of small, white coloured clouds.
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http://www.probertencyclopaedia.com/browse/AA.HTM

A principal cloud type, white and/or gray in color, present in the mid-altitudes with a cumuliform-like shape.
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http://www.stormfax.com/wxwords.htm

[
n] - a cumulus cloud at an intermediate altitude of 2 or 3 miles
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http://www.webdictionary.co.uk/definition.php?query=altocumulus

a principal middle level cloud type (cloud genus), white or gray, or both white and gray, which occurs as a layer or patch with a wave aspect, the elements of which appear as laminae, rounded masses, rolls, etc; these elements usually are sharply outlined, but they may become partly fibrous or diffuse; they may or may not be merged, and they gener...
Found on
https://nsidc.org/cryosphere/glossary?page=1
altocumulus cloud noun a cumulus cloud at an intermediate altitude of 2 or 3 miles
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https://www.encyclo.co.uk/local/20974

a cloud of a class characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus: of medium altitude, about 8000–20,000 ft. (2450–6100 m).
Found on
https://www.infoplease.com/dictionary/altocumulus
No exact match found.