Etymology
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nugget (n.)

1852, "lump of gold," probably from southwestern England dialectal nug "lump," a word of unknown origin [OED]. Another theory is that it is from a misdivision of an ingot. Transferred sense (of truth, etc.) is from 1859.

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Definitions of nugget

nugget (n.)
a solid lump of a precious metal (especially gold) as found in the earth;
From wordnet.princeton.edu