AccordingtoGeneRoddenberry,trititanium is the material fromwhich the hull of theEnterpriseismadeof in his novelization of ST:TMP. ST:TNGalso assumed trititanium to be what the hull of the Enterprise-D is made of, and also a general Starfleet hull-making material.
material the of . : to
It'snotclearifit'smeanttobe the samematerialas"[[tritanium]]"whichTOS"Obsession"identifiesas"20timesharderthandiamond".