凹角 おうかく noun (common) (futsuumeishi) 凹角おうかく Noun English JMdict (multilingual) 1 noun (common) (futsuumeishi) mathematics concave angle;(a) re-entrant 漢字 kanji used 凹 concave, hollow 5画 角 angle, corner 7画
凹角おうかく Noun English JMdict (multilingual) 1 noun (common) (futsuumeishi) mathematics concave angle;(a) re-entrant
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