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The Collaborative International Dictionary of English v.0.48 (gcide)

Nugget \Nug"get\, n. [Earlier niggot, prob. for nigot, an ingot.
See {Ingot}.]
1. A lump; a mass, esp. a native lump of a precious metal;
as, a nugget of gold.
[1913 Webster]

2. Something of value, usually found among many other less
valuable things; -- often used figuratively; as, a nugget
of useful information in a sea of data.
[PJC]