1. twilight zone the ambiguous region between two categories or states or conditions (usually containing some features of both)
  2. twilight sleep a state of general anesthesia in which the person retains a slight degree of consciousness; can be induced by injection of scopolamine or morphine
  3. thoughtlessness the trait of not thinking carefully before acting
  4. twilight vision the ability to see in reduced illumination (as in moonlight)
  5. daylight savings time during which clocks are set one hour ahead of local standard time; widely adopted during summer to provide extra daylight in the evenings
  6. Deltasone a dehydrogenated analogue of cortisol
  7. tediousness dullness owing to length or slowness
  8. dizziness a reeling sensation; a feeling that you are about to fall
  9. straight sinus an unpaired sinus of the dura mater
  10. flightiness the trait of acting unpredictably
  11. toilet-trained (of children) trained to use the toilet
  12. lightlessness total absence of light
  13. tumultuousness a state of commotion and noise and confusion
  14. lightness the property of being comparatively small in weight
  15. slightness smallness of stature
  16. righteousness the quality of adhering to moral principles
  17. weightlessness the property of being comparatively small in weight
  18. solicitousness a feeling of excessive concern
  19. twilight the time of day immediately following sunset
  20. melodiousness the property of having a melody

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