Definition of cumulus in English:

cumulus

noun

Meteorology
  • Cloud forming rounded masses heaped on each other above a flat base at fairly low altitude.

    • ‘When the air condenses into small, lumpy, low pockets of cloud, this is cumulus.’
    • ‘The azure sky above was only slightly clouded by the thick cumulus clouds that strayed away from each other, to occasionally cover up the sun's streams of rays.’
    • ‘The first normally is associated with vertical clouds such as cumulus.’
    • ‘The basic cloud forms are cumulus, which are heaped clouds; stratus, which are layer clouds; and cirrus, which are wispy.’
    • ‘These types of funnel clouds form out of large cumulus clouds or very weak thunderstorms and normally do not have the energy to reach the ground.’

Origin

Mid 17th century (denoting a heap or an accumulation): from Latin, ‘heap’.

Pronunciation

cumulus

/ˈkjumjələs//ˈkyo͞omyələs/