D defs.my
Entry 1 sense Webster, 1913

Alto-cumulus

· Al·to-cu·mu·lus · IPA
01 n. A fleecy cloud formation consisting of large whitish or grayish globular cloudlets with shaded portions, often grouped in flocks or rows.
  1. 1.
    A fleecy cloud formation consisting of large whitish or grayish globular cloudlets with shaded portions, often grouped in flocks or rows.(Meteor.)