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]