Main Entry: cu·mu·lus

Pronunciation: \-ləs\

Function: noun

Inflected Form(s): plural cu·mu·li \-ˌlī, -ˌlē\

Etymology: Latin

Date: 1659

1 : heap, accumulation
2 [New Latin, from Latin] : a dense puffy cloud form having a flat base and rounded outlines often piled up like a mountain — see cloud illustration