ruby corundum

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• Corundum — General Category Oxide mineral – Hematite group Chemical formula Alumi …   Wikipedia

• Ruby — Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• Ruby of arsenic — Ruby Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• Ruby of sulphur — Ruby Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• Ruby of zinc — Ruby Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• Ruby silver — Ruby Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• ruby sulphur — Ruby Ru by, n.; pl. {Rubies}. [F. rubis (cf. Pr. robi), LL. rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber. See {Rouge}, {red}.] 1. (Min.) A precious stone of a carmine red color, sometimes verging to violet, or intermediate between… …   The Collaborative International Dictionary of English

• Corundum — Co*run dum (k[ o]*r[u^]n d[u^]m), n.; pl. {Corundums} (k[ o]*r[u^]n d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are used as… …   The Collaborative International Dictionary of English

• corundum — [kə run′dəm] n. [Tamil kurundam < Sans kuruvinda, ruby] a very hard mineral, aluminum oxide, Al2O3: a dark, coarse variety ( emery) is used for grinding and polishing; clear, transparent varieties ( ruby, sapphire) are used as gems: see MOHS… …   English World dictionary

• corundum — very hard mineral, 1728, from Anglo Indian, from Tamil kurundam ruby sapphire (Skt. kuruvinda), of unknown origin …   Etymology dictionary

• ruby — ► NOUN (pl. rubies) 1) a precious stone consisting of corundum in colour varieties varying from deep crimson or purple to pale rose. 2) an intense deep red colour. ORIGIN Latin rubinus, from rubeus red …   English terms dictionary