dreg

English edit

Borrowed from Old Norse dregg (“sediment”), from Proto-Germanic *dragjō (whence also Icelandic dregg, Swedish drägg), from Proto-Indo-European *dʰrā́ks (“sediment”); see also Latin fraces (“lees of oil”), Albanian ndrag (“to make dirty, foul”), dra (“sediments of dairy products or liquids”).

dreg (countable and uncountable, plural dregs) (chiefly in the plural)

c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals):
What makes this pretty abruption? What too curious dreg espies my sweet lady in the fountain of our love?
1768:O! be the cup of joy to thee consign'd, / Of joy unmix'd, without a dreg behind! — William Hayley, from 'On the Fear of Death, An Epistle to a Lady, 1768', in Poems on Serious and Sacred Subjects 1818.
1910: Fear and trauma may drain to the last dreg the dischargeable nervous energy, and, therefore, the greatest possible exhaustion may be produced by fear and trauma. George W. Crile. in an address delivered at the Massachusetts General Hospital 15 Oct 1910, collected in The Origin and Nature of Emotions