1. quadruplex having four units or components
  2. quadrille a square dance of 5 or more figures for 4 or more couples
  3. quadruple having four units or components
  4. trivialise make trivial or insignificant
  5. quadriceps a muscle of the thigh that extends the leg
  6. quadrillion the number that is represented as a one followed by 15 zeros
  7. quadruplet one of four children born at the same time from the same pregnancy
  8. quadratics a branch of algebra dealing with quadratic equations
  9. quadrivium (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy
  10. quadriplegic a person who is paralyzed in both arms and both legs
  11. quadriplegia paralysis of both arms and both legs
  12. trivialize make insignificant
  13. derivative a compound obtained from another compound
  14. tearfulness sadness expressed by weeping
  15. quadriphonic of or relating to quadraphony
  16. contrivance the faculty of inventive skill
  17. heart valve a valve to control one-way flow of blood
  18. quadrupling increase by a factor of four
  19. clack valve a simple valve with a hinge on one side
  20. Geum rivale erect perennial of north temperate zone having pinnate leaves and a few nodding flowers with a brown-purple calyx and orange and pink petals

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