noun Chemistry.
any salt or ester of oxalic acid, occurring in plants, especially spinach, rhubarb, and certain other vegetables and nuts, and capable of forming an insoluble salt with calcium and interfering with its absorption by the body.

1785–85; oxal(ic) + -ate2

superoxalate, noun
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World English Dictionary
oxalate (ˈɒksəˌleɪt)
a salt or ester of oxalic acid

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American Heritage
Medical Dictionary

oxalate ox·a·late (ŏk'sə-lāt')
A salt or an ester of oxalic acid.

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
oxalate   (ŏk'sə-lāt')  Pronunciation Key 
A salt or ester of oxalic acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It contains crystals of calcium oxalate, an irritant deactivated by heat.
One possibility was sodium oxalate, an unremarkable molecule found in the leaves of rhubarb that has two unstable electrons.
The researchers then expose the material to a lithium salt, which removes the oxalate from the material, forming lithium oxalate.
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