資料來源 : Webster's Revised Unabridged Dictionary (1913)

Alto-cumulus \Al`to-cu"mu*lus\, n. [L. altus high + L. & E.
   cumulus.] (Meteor.)
   A fleecy cloud formation consisting of large whitish or
   grayish globular cloudlets with shaded portions, often
   grouped in flocks or rows.