Definition of dreg
1
: sediment contained in a liquid or precipitated (see precipitate entry 1 sense 3a) from it : lees
—usually used in plural coffee dregs at the bottom of the cup
2
: the most undesirable part
—usually used in plural the dregs of society
3
: the last remaining part : vestige
—usually used in plural the last dregs of fuel
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Merriam-Webster unabridged
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Time Traveler for dreg
The first known use of dreg was in the 14th century
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