tel·son 
(tĕlsən)
(tĕlsən)n.
1. The rearmost segment of the body of certain arthropods.
2. An extension of this segment, such as the middle lobe of the tail of a lobster or the stinger of a scorpion.
[Greek, limit.]
- threescore
- three sheets in the wind
- three sheets to/in the wind
- three sheets to the wind
- Three Sisters
- threesome
- three-square
- three squares a day
- three-toed sloth
- three way
- three-way
- three-wheeler
- thremmatology
- threnodial
- threnodic
- threnodist
- threnody
- threonine
- thresh
- thresher
- thresher shark
- threshing machine
- threshold
- threw
- thrice