One of the mysteries of the English language finally explained.
1An oxide of chlorine (dichlorine trioxide), Cl₂O₃, which is a brown crystalline substance at low temperatures and is explosively unstable.
2A dark red oxide of chlorine formed by the reaction of chlorine dioxide and ozone, existing as a dimeric gas, Cl₂O₆, or as an ionic liquid or solid, [ClO₂ +ClO₄ −] (dichlorine hexoxide.).
Mid 19th century.
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