Acute angle
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〘 noun 〙① An angle smaller than a right angle. ⇔ Obtuse angle. [Engineering Vocabulary (1886)]② An angle that feels sharp. It is also used as an analogy for something sharp. ※Kaitei Gunkan (1900)〈Oshikawa Harunami〉 15 "The shape of the boat〈omitted〉 resembles that of a throwing gun, with both ends forming a kind of strange acute angle ." Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙① 直角よりも小さい角。⇔鈍角。〔工学字彙（1886）〕② 鋭く感じられる角度。また、鋭いことのたとえにもいう。※海底軍艦（1900）〈押川春浪〉一五「艇の形は、〈略〉投鎗(なげやり)の形に髣髴として、其両端は一種奇妙の鋭角(エイカク)をなして居る」
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