Definition of blue morpho
: any of various large butterflies of the genus Morpho (such as M. peleides and M. menelaus) having a brilliant blue metallic luster on the upper surface of the wings
- Just then, a blue morpho, the size of my palm, landed on my blue-flowered knapsack.
- —Erin Taylor Monroney, National Geographic Traveler, January 1998
- Blue morphos often fly in long chains of five or more, making them almost seem to dance as they move through the air.
- —Lynn Edge, Birmingham (Alabama) News, 29 Aug. 2010
