1. arbitrary based on or subject to individual discretion or preference
  2. master bedroom the principal bedroom in a house
  3. snare drum a small drum with two heads and a snare stretched across the lower head
  4. boardroom a room where a committee meets
  5. spare tire excess fat around the waistline
  6. spare part an extra component of a machine or other apparatus
  7. Cypripedium genus of chiefly American perennial leafy-stemmed orchids: lady's slippers; sometimes includes species of genus Paphiopedilum
  8. spare time time that is free from duties or responsibilities
  9. sapphire berry deciduous shrub of eastern Asia bearing decorative bright blue fruit
  10. tobacco budworm larva of a noctuid moth
  11. perpetrate perform an act, usually with a negative connotation
  12. parapodium one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing
  13. space probe a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation
  14. pore mushroom woody pore fungi
  15. spore-bearing bearing spores instead of producing seeds
  16. Spanish broom tall thornless shrub having pale yellow flowers and flexible rushlike twigs used in basketry; of southwestern Europe and Mediterranean; naturalized in California
  17. superpatriotism fanatical patriotism
  18. stateroom a guest cabin
  19. bedroom a room used primarily for sleeping
  20. barbed wire strong wire with barbs at regular intervals used to prevent passage