1. dress circle a curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra
  2. back circle a feat in which an acrobat arches the back from a prone position and bends the knees until the toes touch the head
  3. fairy circle a ring of fungi marking the periphery of the perennial underground growth of the mycelium
  4. dip circle a measuring instrument for measuring the angle of magnetic dip (as from an airplane)
  5. in circles without making progress
  6. dark horse a racehorse about which little is known
  7. tank circuit an oscillatory circuit
  8. dark glasses spectacles that are darkened or polarized to protect the eyes from the glare of the sun
  9. hour circle a great circle on the celestial sphere that passes through both celestial poles
  10. Dark Ages the period of history between classical antiquity and the Italian Renaissance
  11. dark chocolate chocolate liquor with cocoa butter and small amounts of sugar and vanilla; lecithin is usually added
  12. parquet circle seating at the rear of the main floor
  13. Marcus Aurelius Emperor of Rome
  14. great circle a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
  15. traffic circle a road junction at which traffic streams circularly around a central island
  16. order Ericales Ericaceae
  17. order Xyridales an order of monocotyledonous herbs
  18. order Agaricales typical gilled mushrooms belonging to the subdivision Basidiomycota
  19. Artaxerxes king of Persia who sanctioned the practice of Judaism in Jerusalem (?-424 BC)
  20. Drixoral the trade name for a drug used to treat upper respiratory congestion; it contains an antihistamine and a bronchodilator and a vasoconstrictor