1. closed book something that baffles understanding and cannot be explained
  2. calisthenics light exercises designed to promote general fitness
  3. closed chain a chain of atoms in a molecule that forms a closed loop
  4. closed-chain having atoms linked by bonds represented in circular or triangular form
  5. closed loop a control system with a feedback loop that is active
  6. closed-door not open to the public
  7. callisthenics light exercises designed to promote general fitness
  8. closet queen a negative term for a homosexual man who chooses not to reveal his sexual orientation
  9. closet auger a snake used to unblock toilets
  10. close-packed packed especially tightly
  11. closed shop a company that hires only union members
  12. Calocedrus tall evergreens of western North America and eastern Asia
  13. cleistogamous exhibiting or relating to cleistogamy
  14. closed couplet a rhymed couplet that forms a complete syntactic unit
  15. closedown termination of operations
  16. casebook a book in which detailed written records of a case are kept and which are a source of information for subsequent work
  17. closed universe (cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter
  18. Cleistes rosea orchid of central and northern South America having 1- to 3-blossomed racemes of large showy rose-colored flowers; sometimes placed in genus Pogonia
  19. glossitis inflammation of the tongue
  20. closed primary a primary in which only registered members of a particular political party can vote