Meaning 1: The most undesirable part of something
* Antonyms: Best, finest, cream of the crop, elite, top tier, essence, quintessence
Meaning 2: Sediment at the bottom of a liquid
* Antonyms: Clear, pure, unfiltered, pristine, top, surface
Meaning 3: The lowest, most worthless part of society
* Antonyms: Elite, aristocracy, upper class, nobility, gentry
The best antonym for "dregs" depends on the specific context in which it is used.