per·bo·rate

[per-bawr-eyt, -bohr-]
noun Chemistry.
a salt of perboric acid, as sodium perborate, NaBO 3 ⋅4H 2 O, used for bleaching, disinfecting, etc.


Origin:
1880–85; per- + borate

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World English Dictionary
perborate (pəˈbɔːreɪt) [Click for IPA pronunciation guide]
 
n
See sodium perborate any of certain salts derived, or apparently derived, from perboric acid. Perborates are used as bleaches in washing powders

Collins English Dictionary - Complete & Unabridged 10th Edition
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Perborate is always a great word to know.
So is quincunx. 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.
Example sentences
Another traditional bleaching agent, sodium perborate may present both human health and ecological concerns.
Reoxidation is commonly done with sodium dichromate, acetic acid, sodium perborate or hydrogen peroxide.
The borates are also generally added, often in the form of sodium perborate.
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