capful

from WordNet (r) 3.0 (2006)

capful
    n 1: the quantity that a cap will hold

from The Collaborative International Dictionary of English v.0.48

Capful \Cap"ful\, n.; pl. {Capfuls}.
   As much as will fill a cap.
   [1913 Webster] +PJC

   {A capful of wind} (Naut.), a light puff of wind.
      [1913 Webster]