nut-brown ( synonym found)
Definition of nut-brown:

(n) : a subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks
Definition of nut-brown:

(n) : a subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks
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