1. double star a system of two stars that revolve around each other under their mutual gravitation
  2. tubeless tire pneumatic tire not needing an inner tube to be airtight
  3. double door two vertical doors that meet in the middle of the door frame when closed
  4. polestar the brightest star in Ursa Minor
  5. pole star the brightest star in Ursa Minor
  6. double stitch a kind of crochet stitch
  7. doubleheader two games played back-to-back
  8. double entry bookkeeper debits the transaction to one account and credits it to another
  9. bolster support and strengthen
  10. double feature two games instead of one
  11. doubletree a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast
  12. duplicity the act of deceiving or acting in bad faith
  13. blue star subshrubs of southeastern United States forming slow-growing clumps and having blue flowers in short terminal cymes
  14. double bar notation marking the end of principal parts of a musical composition; two adjacent bar lines
  15. double standard a code applying more strictly to one group than to another
  16. polyester a complex ester used for making fibers or resins or plastics or as a plasticizer
  17. bluster be gusty, as of wind
  18. blister an elevation of the skin filled with fluid
  19. doublespeak language that conceals or misrepresents the truth
  20. pollster someone who conducts surveys of public opinion