a very small stream 小河,小溪;细流 sweat ran in rivulets down his back. 汗水顺着他的背流下。 ■(literary)a very small river or stream (文)小河;小溪
a brownish European moth with white markings, occurring in rough grassland 花纹宽翅蛾
Perizoma affinitatum, family Geometridae 拉丁名Perizoma affinitatum,尺蛾科
语源
late 16th cent.: alteration of obsolete riveret (from French, literally small river'), perhaps suggested by Italian rivoletto, diminutive of rivolo, based on Latin rivus 'stream'