Definition of -ful suffix from the Oxford Advanced American Dictionary

      

    -ful

     suffix
    suffix
     
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  1. 1
    NAmE//fl//
     
    (in adjectives) full of; having the qualities of; tending to sorrowful masterful forgetful
  2. 2
    NAmE//fʊl//
     
    (in nouns) an amount that fills something handful spoonful
See the Oxford Advanced Learner's Dictionary entry: -ful