1. mental quickness intelligence as revealed by an ability to give correct responses without delay
  2. pinball machine game equipment on which pinball is played
  3. frontal eminence either prominence of the frontal bone above each orbit
  4. dental medicine the branch of medicine dealing with the anatomy and development and diseases of the teeth
  5. prenatal diagnosis any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality
  6. rental income income received from rental properties
  7. dental technician someone who makes dental appliances (bridges and dentures)
  8. mental illness any disease of the mind
  9. Linotype machine a typesetting machine operated from a keyboard that casts an entire line as a single slug of metal
  10. Mandarin Chinese the dialect of Chinese spoken in Beijing and adopted as the official language for all of China
  11. gentleman a man of refinement
  12. frontal sinus one of a pair of cavities in the frontal bone
  13. printing machine a machine that prints
  14. mental balance the healthy psychological state of someone with good judgment
  15. mental deficiency mild mental retardation
  16. gentlemanly befitting a man of good breeding
  17. dental hygienist someone trained to provide preventive dental service
  18. mental image an iconic mental representation
  19. phentolamine a virility drug to treat erectile dysfunction in men
  20. entailment something that is inferred