瓣鳃纲 bànsāigāng bivalves Origin Definitions Defs Strokes Stroke Words Sentences Sents 瓣 bàn noun valve A valve, such as in the heart or a mechanical device, or a lamella鳃 鰓 sāi noun gill the respiratory organ of fish and some other aquatic animals纲 綱 gāng class A level in biological classification, ranking below phylum (门 mén) and above order (目 mù)