the fine thread produced by a silkworm; textiles made of silk

anything thin and long like a thread, such as wire, hair, or julienne strips of food

a tiny bit; a very small amount, often used in set phrases like 一丝不苟 yī​sī​bù​gǒu or 丝毫 sī​háo

(bound form) traditional Chinese stringed instruments, often appearing in the compound 丝竹 sī​zhú

(bound form) a unit of length equal to one ten-thousandth (1/10,000), specifically a decimillimeter (0.1 mm or 丝米 sī​mǐ)

a Chinese surname