1. football coach a coach of football players
  2. virtual reality a hypothetical three-dimensional visual world created by a computer; user wears special goggles and fiber optic gloves etc., and can enter and move about in this world and interact with objects as if inside it
  3. virtual storage (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses
  4. virtual image a reflected optical image (as seen in a plane mirror)
  5. mental block an inability to remember or think of something you normally can do; often caused by emotional tension
  6. caudal block regional anesthesia resulting from injection of an anesthetic into the caudal end of the spinal canal; now largely replaced by epidural anesthesia
  7. violet-black of black tinged with violet
  8. little black ant tiny glossy black ant
  9. California black oak large deciduous tree of the Pacific coast having deeply parted bristle-tipped leaves
  10. ritual killing the act of killing in order to propitiate a deity
  11. dental plaque a film of mucus and bacteria deposited on the teeth that encourages the development of dental caries
  12. purple-black of black tinged with purple
  13. blackjack a gambling game using cards
  14. Indian blackwood East Indian tree having a useful dark purple wood
  15. Australian blacksnake large semiaquatic snake of Australia
  16. naval blockade the interdiction of a nation's lines of communication at sea by the use of naval power
  17. virtual memory (computer science) memory created by using the hard disk to simulate additional random-access memory; the addressable storage space available to the user of a computer system in which virtual addresses are mapped into real addresses
  18. arterial plaque a fatty deposit inside an arterial wall
  19. parietal pleura pleura that lines the inner chest walls and covers the diaphragm
  20. Rio de la Plata an estuary between Argentina and Uruguay

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