1. butterfly stroke a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
  2. superfluous more than is needed, desired, or required
  3. butterfly flower shrub or small tree of Dutch Guiana having clusters of pink flowers streaked with purple
  4. butterfly ray a stingray with a short tail and a broad fin
  5. butterfly orchid orchid of Florida and the Bahamas having showy brightly colored flowers; sometimes placed in genus Epidendrum
  6. butterfly orchis Mexican epiphytic orchid having pale green or yellow-green flowers with white purple-veined lip
  7. butterfly weed erect perennial of eastern and southern United States having showy orange flowers
  8. butterfly nut a threaded nut with winglike projections for thumb and forefinger leverage in turning
  9. butterflower any of various plants of the genus Ranunculus
  10. breaststroke a swimming stroke
  11. butterfly valve a valve in a carburetor that consists of a disc that turns and acts as a throttle
  12. butterfly-shaped shaped like a butterfly
  13. butter-flower any of various plants of the genus Ranunculus
  14. butterfly effect the phenomenon whereby a small change at one place in a complex system can have large effects elsewhere, e.g., a butterfly flapping its wings in Rio de Janeiro might change the weather in Chicago
  15. powder flask container for carrying gunpowder
  16. butterfly insect typically having a slender body and colorful wings
  17. butterfly plant orchid having large elliptic to obovate fleshy leaves and fragrant pink-and-white flowers dotted with red
  18. masterstroke an achievement demonstrating great skill or mastery
  19. butterfly bush tropical shrub having clusters of white or violet or yellow flowers
  20. butterfly fish small usually brilliantly colored tropical marine fishes having narrow deep bodies with large broad fins; found worldwide