1. dark matter (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force
  2. dura mater the outermost (and toughest) of the 3 meninges
  3. dark meat the flesh of the legs of fowl used as food
  4. dekameter a metric unit of length equal to ten meters
  5. back matter written matter following the main text of a book
  6. tachometer measuring instrument for indicating speed of rotation
  7. tachymeter a theodolite designed for rapid measurements
  8. decameter a metric unit of length equal to ten meters
  9. dekametre a metric unit of length equal to ten meters
  10. ergometer measuring instrument designed to measure power
  11. gray matter greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
  12. transmitter any agent that carries and transmits a disease
  13. dark lantern a lantern with a single opening and a sliding panel that can be closed to conceal the light
  14. tacheometer a theodolite designed for rapid measurements
  15. decametre a metric unit of length equal to ten meters
  16. dark-coated covered with dark hair
  17. dark-haired having hair of a dark color
  18. dry battery a voltaic battery consisting of two or more dry cells
  19. grey matter greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
  20. heroic meter a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter

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