tro·po·sphere 
(trōpə-sfîr′, trŏpə-)
(trōpə-sfîr′, trŏpə-)n.
The lowest region of the atmosphere between the earth's surface and the tropopause, characterized by decreasing temperature with increasing altitude.
tropo·spheric (-sfîrĭk, -sfĕr-) adj.
- Delos
- delouse
- Delphi
- Delphian
- Delphic
- transcendental
- transcendentalism
- transcendentalist
- transcendentally
- Transcendental Meditation
- transcendently
- transcontinental
- transcribable
- transcribe
- transcriber
- transcript
- transcriptase
- transcription
- transcriptional
- transcriptionally
- transcriptionist
- transculturation
- transcurrent
- transcutaneous
- transdermal