phos·phate

[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

sub·phos·phate, noun
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Collins
World English Dictionary
phosphate (ˈfɒsfeɪt) [Click for IPA pronunciation guide]
 
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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00:10
Phosphate is always a great word to know.
So is saccharide. Does it mean:
organic compound containing a sugar or sugars
an elementary particle that is a fundamental constituent of matter and existing independently or as the component outside the nucleus of an atom
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
Lithium phosphate or polymer is the best one can get for now.
To make the droplets stable, phosphate is added to the emulsion.
Indeed, iron phosphate batteries are already being sold by more than one
  battery maker for such applications.
As you age, calcium and phosphate may be reabsorbed back into the body from the
  bones, which makes the bone tissue weaker.
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