Japanese.

(dated) The Japanese language.

(dated) A Japanese person.

(UK, dated) A waitress in a Lyons Corner House.

Either of a pair of metal clamps, usually joined by a chain, meant to be worn on the nipples to cause pain, usually in BDSM.

Initialism of National Income and Product Accounts.

plural of nipper

(obsolete) Honshu, the largest island of Japan.

plural of nipple cripple

(slang) A school prank, the act of taking a person's nipple between the thumb and forefinger and then twisting it around roughly.