1. silent movie a movie without a soundtrack
  2. seldom not often
  3. slide valve valve that opens and closes a passageway by sliding over a port
  4. slide rule analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators
  5. solidify become firm
  6. side view a view from the side of something
  7. slate roof a roof covered with slate
  8. salt mine a mine where salt is dug
  9. solidarity a union of interests or purposes among members of a group
  10. slide down fall or sink heavily
  11. slide move smoothly along a surface
  12. slot machine a machine that is operated by the insertion of a coin in a slot
  13. slime any thick, viscous matter
  14. slide by pass by
  15. slideway sloping channel through which things can descend
  16. solid-hoofed having solid hooves
  17. slider a person who slips or slides because of loss of traction
  18. epidemic a widespread outbreak of an infectious disease
  19. leitmotif a melodic phrase that accompanies a person or situation
  20. solidified changed into a solid mass