IPA: /ˈboʊl.fəl/
KK: /ˈboʊlˌfʊl/
The amount of something that can fit inside a bowl.
She served a bowlful of soup to each guest.
Bowlful → It is formed from "bowl" (from Old English *bolla*, meaning a rounded container) and "-ful" (meaning full of). The word "bowlful" means full of a bowl or the amount that a bowl can hold.
Think of a 'bowl' as a rounded container and '-ful' meaning full of — so a bowlful is the amount that fills a bowl.