Pronunciation: (nef'yOOor, esp. Brit., nev'yOO),[key] —n. 1. a son of one's brother or sister.
2. a son of one's spouse's brother or sister.
3. an illegitimate son of a clergyman who has vowed celibacy (used as a euphemism).
4. Obs.a direct descendant, esp. a grandson.
5. Obs.a remote male descendant, as a grandnephew or cousin.