'Cupful' definitions:

Definition of 'cupful'

From: WordNet
noun
The quantity a cup will hold; "he drank a cup of coffee"; "he borrowed a cup of sugar" [syn: cup, cupful]

Definition of 'Cupful'

From: GCIDE
  • Cupful \Cup"ful\ (k?p"f?l), n.; pl. Cupfuls (-f?lz). As much as a cup will hold. [1913 Webster]