altocumulusWiktionary 原文英美构词拆解altoalto-前缀cumuluscumulus词干alto-(meteorology) relating to clouds of middle étage词源说明From alto- + cumulus.释义名词noun1(physics, meteorology) A fleecy cloud formation consisting of large whitish or greyish globular cloudlets with shaded portions, often grouped in flocks or rows. (Abbreviated Ac.)