MITRE is validvalid

to miter [v MITRED, MITRES, MITRING]

10,589 of 196,601 in NWL2023·also valid in CSW24

a high, pointed headdress, cleft crosswise on top and with two ribbons hanging from the back, worn by archbishops and bishops [n -S] / to join with a mitre joint, also MITER [v MITRED, MITRING, MITRES]