The Collaborative International Dictionary
Unmitre
Unmiter \Un*mi"ter\, Unmitre \Un*mi"tre\, v. t. [1st pref. un- +
miter.]
To deprive of a miter; to depose or degrade from the rank of
a bishop.
--Milton.
Wiktionary
unmitre
vb. (context transitive English) To deprive of a mitre; to depose from the rank of bishop.