The Collaborative International Dictionary of English v.0.48:

Thimbleful \Thim"ble*ful\, n.; pl. Thimblefuls.
   As much as a thimble will hold; a very small quantity.
   [1913 Webster]

         For a thimbleful of golf, a thimbleful of love.
                                                  --Dryden.
   [1913 Webster]