thir•ty-thirdPronunciation: (thûr'tē-thûrd'), [key]
next after the thirty-second; being the ordinal number for 33.
being one of 33 equal parts.
a thirty-third part, esp. of one (1/33
the thirty-third member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.