nipperkin

Probably from nip (“a dram or sip”) + -er +‎ -kin as in kilderkin.

nipperkin (plural nipperkins)

1. (archaic) A small cup or other vessel, of perhaps 1/8 pint in volume.
2. (archaic) A small amount of beer, wine, or other liquid, of perhaps 1/8 pint in volume.

• nip