miter (n.2)youdaoicibaDictYouDict[miter 词源字典]
in the carpentry sense of "joint at a 45 degree angle," 1670s, perhaps from mitre, via notion of joining of the two peaks of the folded cap. As a verb from 1731.[miter etymology, miter origin, 英语词源]
miter (n.1)youdaoicibaDictYouDict
alternative spelling of mitre (see -re).