IPA: /ˈʃɛlf.fəl/
KK: /ˈʃɛlffəl/
The quantity of items that can be placed on a shelf.
The bookstore has a shelfful of new novels waiting to be displayed.
The word 'shelfful' is formed from 'shelf' (from Old English *scylf*, meaning a flat surface or ledge) and '-ful' (meaning full of). Thus, 'shelfful' means full of shelves or having many shelves.
Think of a 'shelf' as a flat surface that holds items, and '-ful' means full of — so 'shelfful' describes something that is full of shelves.