Definition of niddick in US English:

niddick

noun

English Regional, Pembrokeshire, South-Western, Welsh English
  • The nape of the neck.

Origin

Mid 16th century; earliest use found in Thomas Phaer (?1510–1560), translator and physician. Origin unknown; perhaps compare -ock.

Pronunciation

niddick

/ˈnɪdɪk/