- firstFirst of the ten Heavenly Stems; used to indicate the first position in a sequence or rank, often equivalent to "A" or "I" in English lists; ancient Chinese compass point (75°)
- sulfur(bound form) sulfur; commonly written as 硫黄
- 磷 nounphosphorusthe nonmetallic chemical element with the symbol P; a solid element that exists in several forms such as white, red, and black phosphorus
- 定 particleverbfixed(bound form) stable; settled; already agreed upon or established by rule