Definition from Wiktionary, the free dictionary
posset (plural possets)
- A beverage composed of hot milk curdled by some strong infusion, such as wine.
- I have drugged their posset.
- (obsolete) To curdle; to turn, as milk; to coagulate; as, to posset the blood
- To treat with possets; to pamper
- third-person singular imperfect active subjunctive of "he would be able (to)"