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  1. superoxide anion the univalent anion O2-
  2. superstition an irrational belief arising from ignorance or fear
  3. superoxide a metallic oxide containing the univalent anion O2-
  4. hyperextension greater than normal extension
  5. superordination the semantic relation of being superordinate or belonging to a higher rank or class
  6. superficial of, affecting, or being on or near the surface
  7. superfluous more than is needed, desired, or required
  8. supersede take the place or move into the position of
  9. superfetation fertilization of a second ovum after a pregnancy has begun
  10. supercilious having or showing arrogant superiority
  11. approximation a rough calculation of quantity or degree or worth
  12. superposition the placement of one thing on top of another
  13. supervision act or process of overseeing a person, group, or activity
  14. suberic acid a dicarboxylic acid found in cork
  15. hydroxide ion the anion OH having one oxygen and one hydrogen atom
  16. supersession act of replacing one person or thing by another especially one held to be superior
  17. subrogation (law) the act of substituting of one creditor for another
  18. hyperextend extend a joint beyond its normal range
  19. press down on exert a force with a heavy weight
  20. superscription an inscription written above something else