beetle

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); letter "A" or roman "I" in list "A, B, C", or "I, II, III" 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 in the baojia 保甲[bao3 jia3] system (old); ancient Chinese compass point: 75°

methane CH4

first year of the sixty-year cycle (where each year is numbered with one of the 10 heavenly stems 天干[tian1 gan1] and one of the 12 earthly branches 地支[di4 zhi1]); the sixty-year cycle

(anatomy) thyroid gland