1first of the ten Heavenly Stems 十天干
2(used for an unspecified person or thing)
3first (in a list, as a party to a contract etc)
4armor plating
5shell or carapace
6(of the fingers or toes) nail
7bladed leather or metal armor (old)
8ranking system used in the Imperial examinations (old)
9civil administration unit in the baojia 保甲 system (old)
10ancient Chinese compass point: 75°
11letter "A" or roman "I" in list "A, B, C", or "I, II, III" etc
Examples
xǐ洗jiǎ甲shuǐ水de的wèi dao味道hěn很nán难wén闻。
洗甲水的味道很难闻。
Nail polish remover stinks a lot.
手甲的生长速度比脚甲快四倍。
Fingernails grow nearly four times faster than toenails.
她站在甲板上，长头发随风飞舞。
She stood on the deck with her long hair waving in the wind.