1bil·low 
/ˈbɪloʊ/ noun
plural bil·lows /ˈbɪloʊ/ noun [count] 1 : a moving cloud or mass of smoke, steam, etc.
▪ Billows of smoke poured out of the burning building. ▪ billows of fog 2 literary + old-fashioned : a large wave
▪ the rolling billows of the sea
▪ Billows of smoke poured out of the burning building. ▪ billows of fog
▪ the rolling billows of the sea
