茧丝 jiǎnsī silk Origin Definitions Defs Strokes Stroke Words Sentences Sents 茧 繭 jiǎn noun cocoon The protective casing spun by a caterpillar or larva before it turns into a pupa; usually refers to a silkworm cocoon used for making silk.丝 絲 sī noun silk the fine thread produced by a silkworm; textiles made of silk