1. protagonist the principal character in a work of fiction
  2. line of products a particular kind of product or merchandise
  3. Cartesian product the set of elements common to two or more sets
  4. cross product a vector that is the product of two other vectors
  5. prodigious great in size, force, extent, or degree
  6. plant product a product made from plant material
  7. private practice the practice of a profession independently and not as an employee
  8. partial verdict (criminal law) a finding that the defendant is guilty of some charges but innocent of others
  9. pair production the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
  10. software product merchandise consisting of a computer program that is offered for sale
  11. dairy product milk and butter and cheese
  12. waste product any materials unused and rejected as worthless or unwanted
  13. private property movable property (as distinguished from real estate)
  14. surge protector electrical device inserted in a power line to protect equipment from sudden fluctuations in current
  15. reproductive producing new life or offspring
  16. byproduct a secondary and sometimes unexpected consequence
  17. by-product a secondary and sometimes unexpected consequence
  18. scalar product a real number (a scalar) that is the product of two vectors
  19. vector product a vector that is the product of two other vectors
  20. animal product a product made from animal material