The Collaborative International Dictionary of English v.0.48:

Rouleau \Rou`leau"\, n.; pl. F. Rouleaux (F. ?; E. ?), E.
   Rouleaus. [F., a roll, dim. fr. fr. r[^o]le, formerly also
   spelt roulle. See Roll.]
   A little roll; a roll of coins put up in paper, or something
   resembling such a roll.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rouleau
    n 1: a roll of ribbon
    2: a roll of coins wrapped in paper

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "rouleau":
   bale, barrel, bindle, bole, bolt, bouquet, budget, bundle, cask,
   coin, column, crown, cylinder, cylindroid, deck, double eagle,
   doubloon, drum, ducat, eagle, fagot, fardel, fasces, fascine,
   five-dollar gold piece, gold piece, guinea, half crown, half eagle,
   hard money, moidore, napoleon, nosegay, pack, package, packet,
   parcel, piece, piece of money, piece of silver, pillar, pipe, posy,
   pound sovereign, quiver, roll, roll of coins, roller, sheaf,
   sovereign, specie, ten-dollar gold piece, trunk, truss, tube,
   twenty-dollar gold piece