化纤
huà xiān · HSK 7
fiber
🧵 化纤 = 化 chemical/-ize + 纤 fiber; short for 化学纤维, fiber made by chemistry
化 carries the sense of transform or chemical (as in 化学, chemistry), and 纤 means fine fiber. Together they abbreviate 化学纤维: fiber synthesized chemically rather than grown, like polyester or nylon.
化 — person 亻 + spoon/upside-down person 匕
化 is an associative compound showing a standing person 亻 next to 匕, originally a depiction of a person turned upside-down. Together they suggest a figure transforming from one state to another, giving the core meaning 'change' or 'transform'. The character later extended to senses like 'convert', 'influence', and the noun suffix '-ization'.