IPA: /ˈpleɪt.fəl/
KK: /ˈpleɪtˌfʊl/
A large amount of food that fills a plate.
She served a plateful of spaghetti for dinner.
Plateful → It is formed from "plate" (from Old French *plate*, meaning a flat dish or shallow container) and "-ful" (meaning full of). The word "plateful" means a quantity that fills a plate.
Think of a 'plate' as a flat dish that holds food, and '-ful' means it is full. So, a plateful is simply a full plate.