An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Antineutron
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The [antimatter] equivalent of a [neutron]. Just like neutrons, antineutrons have no charge. However, antineutrons are made of antiquarks, which have the opposite charges of a neutrons quarks; as such, neutrons and antineutrons will annihilate upon contact.
Antineutron meaning & definition 1 of Antineutron.
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