The Collaborative International Dictionary of English v.0.48:

Dribblet \Drib"blet\, Driblet \Drib"let\, n. [From Dribble.]
   A small piece or part; a small sum; a small quantity of money
   in making up a sum; as, the money was paid in dribblets.
   [1913 Webster]

         When made up in dribblets, as they could, their best
         securities were at an interest of twelve per cent.
                                                  --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

driblet
    n 1: a small indefinite quantity (especially of a liquid); "he
         had a drop too much to drink"; "a drop of each sample was
         analyzed"; "there is not a drop of pity in that man";
         "years afterward, they would pay the blood-money, driblet
         by driblet"--Kipling [syn: drop, drib, driblet]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "driblet":
   ace, atom, bit, dab, dole, dot, dram, dribble, droplet, dwarf,
   farthing, fleck, flyspeck, fragment, globule, gobbet, grain,
   granule, groat, hair, handful, iota, jot, little, little bit,
   minim, minimum, minutiae, mite, modicum, molecule, mote, nutshell,
   ounce, particle, pebble, pinch, pittance, point, scrimption,
   scruple, smidgen, smitch, speck, spoonful, spot, thimbleful,
   tiny bit, tittle, trifling amount, trivia, whit