Face angle

Japanese: 面角 - めんかく

〘noun〙① The angle between two planes. When two planes intersect, the angle between two straight lines on each plane that are perpendicular to the line of intersection. [English-Japanese and Japanese-English Earth Science Dictionary (1914)]② In crystallography, the angle between two crystal faces that sandwich an edge. ※Seikoku Risshihen (1870-71) (translated by Nakamura Masanao), 15 "It means to roughly cut out the face angle."③ The angle at which the jaw protrudes forward. Total side angle.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① 二平面のなす角。二平面が交わるとき、おのおのの平面上にあって交線に垂直な二直線のなす角。〔英和和英地学字彙（1914）〕② 結晶学で、一つの稜をはさんだ二結晶面のつくる角度。※西国立志編（1870‐71）〈中村正直訳〉一五「面角を粗く砍(きり)出だすことなり」③ 顎(あご)の前方突出角度。全側面角。

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