Alto-cumulus
Pronunciation : Al`to-cu"mu*lus
Part of Speech : n. [L. altus high + L. & E. cumulus.] (Meteor.)
Definition : Defn: A fleecy cloud formation consisting of large whitish or grayish globular cloudlets with shaded portions, often grouped in flocks or rows.
Source : Webster's Unabridged Dictionary, 1913