mitre

(noun) joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner. Synonyms: miter joint, mitre joint, miter.

(noun) the surface of a beveled end of a piece where a miter joint is made. Synonyms: miter. Example: "He covered the miter with glue before making the joint."

(noun) a liturgical headdress worn by bishops on formal occasions. Synonyms: miter.