n.1.(Meteor.) A fleecy cloud formation consisting of large whitish or grayish globular cloudlets with shaded portions, often grouped in flocks or rows.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Clare, a former pupil of St Thomas More School, used the scientific names of clouds for families who live in the village, such as Alto-cumulus.
But this will be Alto-cumulus clouds considering the altitude of the upper air trough.
There was scattered to broken strato- and alto-cumulus that built from about 1500 feet AGL (3500 MSL) all the way up to 10,000 feet.