monarch
Pronunciation: /ˈmɒnək/
noun
- 1a sovereign head of state, especially a king, queen, or emperor: the reigning monarch this followed an attempt by the deposed monarch to regain his throne
- 2 (also monarch butterfly) a large migratory orange and black butterfly that occurs mainly in North America. The caterpillar feeds on milkweed, using the toxins in the plant to render both itself and the adult unpalatable to predators. Also called milkweed.
- Danaus plexippus, subfamily Danainae, family Nymphalidae


Origin:
late Middle English: from late Latin monarcha, from Greek monarkhēs, from monos 'alone' + arkhein 'to rule'