Lode definitions

lōd
A vein containing important quantities of metallic ore and filling a well-defined fissure in the rock.
noun
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Any flat deposit of valuable ore separated from the adjoining rock by definite boundaries.
noun
24
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Any abundant or rich source.
noun
21
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A rich source or supply.

Found a lode of important documents in the archives.

noun
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A vein of mineral ore that is deposited between clearly demarcated layers of rock or that fills a fissure in a rock formation.
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The metalliferous ore that fills a fissure in a rock formation.
noun
0
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A vein of mineral ore deposited between clearly demarcated layers of rock.
noun
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(dialectal) A watercourse.
noun
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(mining) A vein of metallic ore that lies within definite boundaries, or within a fissure.
noun
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(by extension) A rich source of supply.
noun
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Origin of lode

Etymologically identical with load, which has however become semantically restricted. The now-archaic lode continues the old sense of Old English lád "way, course, journey" but by the 19th century survived only dialectally in the sense of "watercourse", as a technical term in mining, and in the compounds lodestone, lodestar.