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low-grade

[loh-greyd]
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adjective
  1. of an inferior quality, worth, value, etc.: The mine yields low-grade silver ore.

Origin of low-grade

First recorded in 1875–80; low1 + grade
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for low-grade

adj.

1867, originally in mining, with reference to ores, from low (adj.) + grade (n.).

Online Etymology Dictionary, © 2010 Douglas Harper