phosphate

[fos-feyt]
noun
1.
Chemistry.
a.
(loosely) a salt or ester of phosphoric acid.
b.
a tertiary salt of orthophosphoric acid, as sodium phosphate.
2.
Agriculture. a fertilizing material containing compounds of phosphorus.
3.
a carbonated drink of water and fruit syrup containing a little phosphoric acid.

Origin:
1785–95; phosph- + -ate2

subphosphate, noun
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World English Dictionary
phosphate (ˈfɒsfeɪt)
 
n
1.  any salt or ester of any phosphoric acid, esp a salt of orthophosphoric acid
2.  (often plural) any of several chemical fertilizers containing phosphorous compounds
 
[C18: from French phosphat; see phosphorus,-ate1]
 
phosphatic
 
adj

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

phosphate
1795, from Fr. phosphate (1787), from phosphore (see phosphorous).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

phosphate phos·phate (fŏs'fāt')
n.
A salt or an ester of phosphoric acid. adj.
Containing the trivalent radical PO4.

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
phosphate   (fŏs'fāt')  Pronunciation Key 
A salt or ester of phosphoric acid, containing the group PO4. Phosphates are important in metabolism and are frequently used in fertilizers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For example, some scientists have fretted over the world's limited supplies of
  rock phosphate, which is used in agriculture.
To make the droplets stable, phosphate is added to the emulsion.
It may be light, or a familiar nutrient such as nitrate or phosphate.
They heated it, added oxygen and calcium, then applied more heat and a
  phosphate solution.
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