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《1615》 
LL aera number by which reckoning is made ← L aera (brass) counters, items of calculation (pl.) ← aes brass, money: cf. ore
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《1615》 LL aera number by which reckoning is made ← L aera (brass) counters, items of calculation (pl.) ← aes brass, money: cf. ore
ERA
研究社新英和大辞典 ページ 187760 での【brasspl.】単語。
