1. deadly sin an unpardonable sin entailing a total loss of grace
  2. delusion a mistaken or unfounded opinion or idea
  3. deadline the point in time at which something must be completed
  4. deadliness the quality of being deadly
  5. cytolysin a substance that partly or completely destroys animal cells
  6. tidal zone an area subject to tidal action
  7. deathless never dying
  8. didanosine an antiviral drug used to combat HIV infection
  9. catalyst substance that initiates or accelerates a chemical reaction
  10. dearly-won entailing great loss or sacrifice
  11. hemolysin any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin
  12. deadly causing or capable of causing death
  13. vital sign sign of life
  14. deadlock a situation in which no progress can be made
  15. headline the title or caption of a newspaper article
  16. deadlocked at a complete standstill because of opposition of two unrelenting forces or factions
  17. deadpan deliberately impassive in manner
  18. haemolysin any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin
  19. diddly-squat a small worthless amount
  20. neurolysin any toxin that affects neural tissues