iron oxides
plural of iron oxide
(Freemasonry) A Masonic organization that one can join after completing the three basic Blue Lodge degrees (Entered Apprentice, fellowcraft, and Master Mason), and which offers more advanced teaching.
plural of lotful
(geometry) The center of a circumcircle (the circle that passes through every vertex of a given triangle or other cyclic polygon).
博物館の地質学者は峡谷の岩壁の赤い色合いが酸化鉄類によることを説明した。
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