Definitions
first of the ten heavenly stems 十天干[shi2 tian1 gan1]
(used for an unspecified person or thing)
first (in a list, as a party to a contract etc)
armor plating
shell or carapace
(of the fingers or toes) nail
bladed leather or metal armor (old)
ranking system used in the Imperial examinations (old)
civil administration unit (old)