ruby

• IPA^(key): /ˈɹuː.bi/
• Rhymes: -uːbi

• Audio (UK)

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From Middle English ruby, rube, from Old French rubi, from Medieval Latin rubīnus.

ruby (countable and uncountable, plural rubies)

1. A clear, deep, red variety of corundum, valued as a precious stone.
   • 2012 March, Lee A. Groat, “Gemstones”, in American Scientist‎, volume 100, number 2, archived from the original on 14 June 2012, page 128:

     Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.

2. (obsolete) A red spinel.
3. A deep red colour.

   ruby:  

   • c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act III, scene iv]:

     When now I thinke you can behold such sights, / And keepe the naturall Rubie of your Cheekes, / When mine is blanch'd with feare.

4. (heraldry) The tincture red or gules.
   • 1720, Francis Nichols, Rudiments of Honour, page 296:

     Elgin. Topaz a Saltier and Chief Ruby, on a Canton Pearl a Lyon Rampant Saphyr, which last is their paternal Coat; and the Field Topaz, and Saltier, and Chief Ruby, was the Arms of King Robert the Bruce, they altering the Field from Pearl (as he bore it) to Topaz.

   • 1726, John Guillim, The Banner Display'd; Or, an Abridgment of Guillim, page 504:

     The Field is Ruby, on a Bend Topaz, three Martlets Diamond. [...] Checkie Topaz and Saphire, a Fesse within a Bordure Ruby, by the Name of Clifford.

   • 1754, John Lodge, The Peerage of Ireland; Or, a Genealogical History of the ..., page 71:

     (1) Pearl, a Cross, Ruby, with the Effigies of our Saviour thereon, Topaz, born in Memory of one of the Family's fighting against the Turks. (2) Topaz, a Chief Indented, Saphire. (3) Ruby, three covered Cups, Topaz [...]

5. (uncountable, printing, UK, dated) The size of type between pearl and nonpareil, standardized as 5½-point.

   Synonym: (US) agate

6. A ruby hummer, a South American hummingbird, Clytolaema rubricauda.
7. A red bird-of-paradise, Paradisaea rubra.

ruby (comparative more ruby, superlative most ruby)

1. Of a deep red colour.

ruby (third-person singular simple present rubies, present participle rubying, simple past and past participle rubied)

1. (transitive, poetic) To make red; to redden.
   • 1725–1726, Homer, “Book 20”, in [William Broome, Elijah Fenton, and Alexander Pope], transl., The Odyssey of Homer. […], London: […] Bernard Lintot, →OCLC:

     With sanguine drops the walls are rubied

• (reds) red; blood red, brick red, burgundy, cardinal, carmine, carnation, cerise, cherry, cherry red, Chinese red, cinnabar, claret, crimson, damask, fire brick, fire engine red, flame, flamingo, fuchsia, garnet, geranium, gules, hot pink, incarnadine, Indian red, magenta, maroon, misty rose, nacarat, oxblood, pillar-box red, pink, Pompeian red, poppy, raspberry, red violet, rose, rouge, ruby, ruddy, salmon, sanguine, scarlet, shocking pink, stammel, strawberry, Turkey red, Venetian red, vermilion, vinaceous, vinous, violet red, wine ^{(Category: en:Reds)}
• carbuncle
• corundum
• spinel
• Ruby on Wikipedia.Wikipedia

• David Barthelmy (1997–2024) “Ruby”, in Webmineral Mineralogy Database.
• “ruby”, in Mindat.org‎, Hudson Institute of Mineralogy, 2000–2024.

From the British 5½-point type size ruby (etymology 1), used for annotations in printed documents.

ruby (plural rubies)

1. (typography) A pronunciation guide written above or beside Chinese characters.

• rubi

• → Japanese: ルビ (rubi)

• Ruby characters on Wikipedia.Wikipedia

• -bury, Bury, bury

• IPA^(key): [ˈrubɪ]

ruby

1. nominative/accusative/vocative/instrumental plural of rub

Borrowed from Old French rubi, itself borrowed from Latin rubeus.

• rebe, ribe, rube, rubee, rubie, rybe, ryby

• IPA^(key): /ˈriu̯biː/, /ˈriu̯beː/

ruby (plural rubies)

1. A ruby (red precious stone)
2. (figuratively) A precious individual.

• English: ruby

• “rubī(e, n.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007.

ruby

1. Alternative form of robben

• hruby

Inherited from Proto-Slavic *grubъ.

• IPA^(key): /ˈrubɨ/
• Rhymes: -ubɨ
• Syllabification: ru‧by

ruby

1. fat, thick

• ruby in silling.org