nun

Concise Oxford English Dictionary © 2008 Oxford University Press:
nun/nʌn/

▶noun

• 1 a member of a female religious community, typically one living under vows of poverty, chastity, and obedience.

• 2 a pigeon of a breed with a crest on its neck.

– derivatives
nunlike adjective,
nunnish adjective.

– origin OE nonne, from eccles. L. nonna, fem. of nonnus ‘monk’.