GNU Collaborative International Dictionary of English
Found one definition
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Nugget (?), 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]