Monarch Mon"arch, n. [F. monarque, L. monarcha, fr. Gr. ?, ?; mo`nos alone + ? to be first, rule, govern. See {Archi-}.] 1. A sole or supreme ruler; a sovereign; the highest ruler; an emperor, king, queen, prince, or chief. [1913 Webster]

He who reigns Monarch in heaven, . . . upheld by old repute. --Milton. [1913 Webster]

2. One superior to all others of the same kind; as, an oak is called the monarch of the forest. [1913 Webster]

3. A patron deity or presiding genius. [1913 Webster]

Come, thou, monarch of the vine, Plumpy Bacchus. --Shak. [1913 Webster]

4. (Zo["o]l.) A very large red and black butterfly ({Danais Plexippus}); -- called also {milkweed butterfly} and {monarch butterfly}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.