Definition of rouleau in English:
rouleau
nounPlural rouleaus, Plural rouleaux ˈruːləʊruːˈləʊro͞oˈlō
1A cylindrical packet of coins.
2A coil or roll of ribbon, knitted wool, or other material, especially used as trimming.
Origin
Late 17th century: French, from obsolete French roule 'a roll'.