Meaning of the Sanskrit Word: trtiyah

  tṛtīyaḥ—is the third    SB 3.10.16
  tṛtīyaḥ—the third    SB 8.1.23
  tṛtīyaḥ—the third issue    SB 8.13.10

Can't find any compound Sanskrit words containing trtiyah.