Source : Webster's Revised Unabridged Dictionary (1913)

Spoonful \Spoon"ful\, n.; pl. {Spoonfuls}.
   1. The quantity which a spoon contains, or is able to
      contain; as, a teaspoonful; a tablespoonful.

   2. Hence, a small quantity. --Arbuthnot.

Source : WordNet®

spoonful
     n : as much as a spoon will hold; "he added two spoons of sugar"
         [syn: {spoon}]