[al.to.cu.mu.lus] n, pl -li [NL, fr. L altus + NL -o- + cumulus] (1894): a fleecy cloud formation consisting of large whitish globular cloudlets with shaded portions--see cloud illustration
ALTOCUMULUS
Meaning of ALTOCUMULUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012