3rdThere are examples of how to use ordinal numbers at the entry for fifth.
Word OriginOld Englishthridda, of Germanic origin; related to Dutchderde and Germandritte, also to three. The spelling thrid was dominant until the 16th cent. (but thirdda is recorded in Northumbrian dialect as early as the 10th cent.).Idioms
third time lucky(US Englishthird time is the charm)