頭上的尖帽
字源直接指到這裡：希臘文的「頭帶」變成教會裡那頂立起來的高帽。
noun · C1
A tall pointed hat worn by a bishop or archbishop at church ceremonies, made of two stiff halves that rise to a point at the front and the back.
主教冠
核心畫面
Two flat panels leaning towards each other and meeting at a point.
可以想成兩片平面斜斜地靠向對方，在頂端碰在一起。主教冠是這樣：前後兩片立起來，往上收成一個尖。木工的斜接也是這樣：兩…更多收起
可以想成兩片平面斜斜地靠向對方，在頂端碰在一起。主教冠是這樣：前後兩片立起來，往上收成一個尖。木工的斜接也是這樣：兩個斜面各切一半，靠在一起收成一個角。把這兩個意思擺在同一個畫面裡只是好記，不是說後面那個是從前面那個長出來的——手上的資料只證明兩者同拼法、同字源，沒有交代木工用法怎麼接上去。From the word’s history
From Middle English mytre, from Old French mitre, from Ancient Greek mitra, a headband or turban — something wound or set on the head.
這個字從中古英文 mytre 來，再往前是古法文 mitre，最早是古希臘文 μίτρα（mítra），意思是「頭帶、纏頭巾」。所以字源指的是頭上的東西，這條線直接通到主教冠。順帶一提，資料裡還記著一枚十三世紀的偽幣也叫 mitre，原因是幣面上打了主教冠的印記——那是從帽子借名字，不是另一個來源。
Wiktionary entry for mitre (source_ref kaikki:3f6f69a190036ae4:620724964), etymology_text: Middle English mytre, Old French mitre, Ancient Greek μίτρα (headband, turban); the coin sense from the bishop's mitre stamped upon it.
Two branches
斜切出來的角
同樣是兩個面斜斜地相遇，只是場景換到木工桌上。這是方便記憶的對照，不是歷史上的繼承關係。
noun · C1
A corner joint made by cutting the end of each piece of wood at an angle, usually forty-five degrees, so that the two cut faces meet in a clean corner; also the angled cut or face itself.
斜接（角）
原始詞典資料10 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Mitrename
- 1
A locality in the Rural City of Horsham and the Shire of West Wimmera, western Victoria, Australia.
mitrenoun/ˈmaɪtəɹ/
- 1
A covering for the head, worn on solemn occasions by church dignitaries, which has been made in many forms, mostly recently a tall cap with two points or peaks.
- 2
The surface forming the bevelled end or edge of a piece where a miter joint is made; also, a joint formed or a junction effected by two beveled ends or edges; a miter joint.
- 3
historicalhobbieslifestylenumismaticsA 13th-century coin minted in Europe which circulated in Ireland as a debased counterfeit sterling penny, outlawed under Edward I.
- 4
A cap or cowl for a chimney or ventilation pipe.
- 5
A gusset in sewing, etc.
- 6
raregeometrymathematicssciencesA square with one triangular quarter missing from the outside.
- 7
A mitre shell
mitreverb/ˈmaɪtəɹ/
- 1
To adorn with a mitre.
- 2
To unite at an angle of 45°.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。