湼 niè black mud Origin Definitions Defs Strokes Stroke Words Sentences Sents 沃罗涅日 wòluónièrì Voronezh Voronezh, a city in the southwest of European Russia菲涅耳透镜 fēiniè'ěrtòujìng Fresnel lens a thin, flat lens consisting of a series of concentric steps used to focus light