Definition of -ful in English:
The combining form -ful is used to form nouns meaning ‘the amount needed to fill’ ( cupful, spoonful, etc.). The plural form of such words is cupfuls, spoonfuls, etc. Three cups full would denote the individual cups rather than a quantity measured in cups: on the sill were three cups full of milk; add three cupfuls of milk to the batter.
- British & World English dictionary
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