altocumulus

/AE1 L T OW0 K Y UW1 M Y AH0 L AH0 S/
noun
  1. 1

    A fleecy cloud formation consisting of large whitish or greyish globular cloudlets with shaded portions, often grouped in flocks or rows. (Abbreviated Ac.)

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Source: https://en.wiktionary.org/wiki/altocumulus