The Collaborative International Dictionary of English v.0.48:

Pitcherful \Pitch"er*ful\, n.; pl. Pitcherfuls.
   The quantity a pitcher will hold.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pitcherful
    n 1: the quantity contained in a pitcher [syn: pitcher,
         pitcherful]