/ahr"keuhs/ , n. , pl. arcus . Meteorol.
a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus. Also called roll cloud .
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/ahr"keuhs/ , n. , pl. arcus . Meteorol.
a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus. Also called roll cloud .
[ ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012