Main Entry:

al·to·cu·mu·lus

Pronunciation:

\ˌal-tō-ˈkyü-myə-ləs\

Function:

noun

Inflected Form(s):

plural al·to·cu·mu·li \-ˌlī, -ˌlē\

Etymology:

New Latin, from Latin altus + New Latin -o- + cumulus

Date:

1894

: a fleecy mid-altitude cloud formation consisting of large whitish globular masses with shaded portions — see cloud illustration