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cirrus spissatus A cloud species unique to the genus cirrus, of such optical thickness as to appear grayish on the side away from the sun; and to veil the sun, conceal its outline, or even hide it. These often originate from the upper part of a cumulonimbus, and are often so dense that they suggest clouds of the middle level. Cirrus spissatus is also called thunderstorm cirrus or false cirrus.

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