sep·til·lionth 
(sĕp-tĭlyənth)
(sĕp-tĭlyənth)n.
1. The ordinal number matching the number septillion in a series.
2. One of a septillion equal parts.
sep·tillionth adv. & adj.
- the shoe is on the other foot
- the short end of the stick
- "the Silurist."
- thesis
- thespian
- Thespis
- Thessalian
- Thessalonian
- Thessalonians
- Thessalonica
- Thessaloníki
- Thessaly
- "the Subtle Doctor."
- "the Sun King."
- "the Swamp Fox."
- "the Swedish Nightingale."
- theta
- theta wave
- thetic
- thetical
- thetically
- Thetis
- theurgic
- theurgical
- theurgically