The Chinese word for finger nail is
指甲

zhǐ jiǎ

Chinese Definition

Components
指
1. finger
手指 - finger
2. to point; to point out; to aim
指出 - to point out
指人 - to point at a person
3. to indicate; to show; to demonstrate
4. to refer to; to mean
春天指的是冬天後面的那個季節。 - Spring refers to the season after winter.
5. to rely on; to depend on
6. to criticize; to rebuke
7. to make one’s hair stand on end
甲
1. shell; carapace
2. plate armor
3. nail (plate at the end of fingers and toes)
4. the first of the ten heavenly stems
5. number one; first; A
6. (pronoun for an unspecified or unknown person or thing)
7. (Taiwan) unit of land (area) measure, equivalent to 2,934 1857 roughly 2.1 acres
8. how is it that; how could
9. (Taiwan) since; as
10. (Min Nan) Alternative form of 佮 (kah, kap, t=and; with)
11. (Min Nan) Alternative form of 共 (kā)
12. (Taiwanese Mandarin) gay; homosexual