Plutarch UK /ˈpluː.tɑːk/US /ˈplu.tɑɹk/ noun1 •Any specific edition of a work by Plutarch, often specifically Plutarch's LivesBoth these English Plutarchs are here, two folios printed at London in 1657, and they once belonged to William Penn, the founder of Pennsylvania, and have his book-plates. — 1895 formsPlutarchs