alloy

[n. al-oi, uh-loi; v. uh-loi]
noun
1.
a substance composed of two or more metals, or of a metal or metals with a nonmetal, intimately mixed, as by fusion or electrodeposition.
2.
a less costly metal mixed with a more valuable one.
3.
standard; quality; fineness.
4.
admixture, as of good with evil.
5.
anything added that serves to reduce quality or purity.
verb (used with object)
6.
to mix (metals or metal with nonmetal) so as to form an alloy.
7.
to reduce in value by an admixture of a less costly metal.
8.
to debase, impair, or reduce by admixture; adulterate.

Origin:
1590–1600; < Middle French aloi, Old French alei, noun derivative of aleier to combine < Latin alligāre to bind up, equivalent to al- al- + ligāre to bind (see ally, ligament); replacing earlier allay, Middle English < Anglo-French allai

unalloyed, adjective

allay, alley, alloy, ally (see synonym study at allay).


4. fusion, blend, composite.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alloy
 
n
1.  a metallic material, such as steel, brass, or bronze, consisting of a mixture of two or more metals or of metallic elements with nonmetallic elements. Alloys often have physical properties markedly different from those of the pure metals
2.  something that impairs the quality or reduces the value of the thing to which it is added
 
vb
3.  to add (one metal or element to another metal or element) to obtain a substance with a desired property
4.  to debase (a pure substance) by mixing with an inferior element
5.  to diminish or impair
 
[C16: from Old French aloi a mixture, from aloier to combine, from Latin alligāre, from ligāre to bind]

unalloyed (ˌʌnəˈlɔɪd)
 
adj
not mixed or intermingled with any other thing; pure: unalloyed metal; unalloyed pleasure

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

alloy
1590s, from Anglo-Fr. alai, from O.Fr. aleier "mix with a baser metal," from L. alligare, compound of ad- "to" + ligare "to bind" (see ligament); hence "bind one thing to another."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

alloy al·loy (āl'oi', ə-loi')
n.
A homogeneous mixture or solid solution of two or more metals, the atoms of one replacing or occupying interstitial positions between the atoms of the other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
alloy   (āl'oi')  Pronunciation Key 
A metallic substance made by mixing and fusing two or more metals, or a metal and a nonmetal, to obtain desirable qualities such as hardness, lightness, and strength. Brass, bronze, and steel are all alloys.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
alloy [(al-oy, uh-loy)]

A material made of two or more metals, or of a metal and another material. For example, brass is an alloy of copper and zinc; steel is an alloy of iron and carbon. Alloys often have unexpected characteristics. In the examples given above, brass is stronger than either copper or zinc, and steel is stronger than either iron or carbon.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Not everyone sees the rapid advance of social media and digital technology as
  an unalloyed good.
But that law is not in fact proving to be the unalloyed blessing that its
  creators envisaged.
And you can't ignore the effects of science on people and the environment,
  which is far from an unalloyed good.
Such unalloyed self-alteration suggests a hatred of the original design.
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