sap·phire

[saf-ahyuhr]
noun
1.
any gem variety of corundum other than the ruby, especially one of the blue varieties.
2.
a gem of this kind.
3.
the color of this gem, a deep blue.
adjective
4.
resembling sapphire; deep blue: a sapphire sky.
Origin:
1225–75; < Latin sapphīrus < Greek sáppheiros, probably < Semitic (compare Hebrew sappīr; ulterior origin obscure); replacing Middle English safir < Old French < Latin, as above

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Sapphire is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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Collins
World English Dictionary
sapphire (ˈsæfaɪə) [Click for IPA pronunciation guide]
 
—n
1.  a.  any precious corundum gemstone that is not red, esp the highly valued transparent blue variety. A synthetic form is used in electronics and precision apparatus. Formula: Al2O3
 b.  (as modifier): a sapphire ring
2.  a.  the blue colour of sapphire
 b.  (as adjective): sapphire eyes
 
[C13 safir, from Old French, from Latin sapphīrus, from Greek sappheiros, perhaps from Hebrew sappīr, ultimately perhaps from Sanskrit śanipriya, literally: beloved of the planet Saturn, from śani Saturn + priya beloved]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sapphire
1272, from O.Fr. saphir (12c.), from L. sapphirus (cf. Sp. zafir, It. zaffiro), from Gk. sappheiros "blue stone" (the gem meant apparently was not the one that now has the name, but perhaps rather "lapis lazuli," the modern sapphire perhaps signified by Gk. hyakinthos), from a Semitic source (cf. Heb.
sappir "sapphire"), but probably not ult. from Semitic; some linguists propose an origin in Skt. sanipriya, a dark precious stone (perhaps sapphire or emerald), lit. "sacred to Saturn," from Sani "Saturn" + priyah "precious." In Renaissance lapidaries, it was said to cure anger and stupidity.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sapphire   (sāf'īr')  Pronunciation Key 
A clear, fairly pure form of the mineral corundum that is usually blue but may be any color except red. It often contains small amounts of oxides of cobalt, chromium, and titanium and is valued as a gem. Compare ruby.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Easton
Bible Dictionary

Sapphire definition


Associated with diamonds (Ex. 28:18) and emeralds (Ezek. 28:13); one of the stones in the high priest's breastplate. It is a precious stone of a sky-blue colour, probably the lapis lazuli, brought from Babylon. The throne of God is described as of the colour of a sapphire (Ex. 24:10; comp. Ezek. 1:26).

Easton's 1897 Bible Dictionary
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Example sentences
Tiny structures in the feathers choreograph incoming light, reflecting sapphire
  in one direction, emerald in another.
With certain impurities it is known as ruby or sapphire silicon dioxide- aka
  quartz.
The sky was sapphire, the sun splendid and pitiless, the heat sweltering.
Picture the world's oceans, glimmering sapphire under the heat of the sun and
  the protection of the ozone layer.
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