Scrabble Dictionary

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Yes, telson is playable

...and is worth 8 points.

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TWL06 (NASPA List 2006)

"Telson" Definition

noun

An extension of this segment, such as the middle lobe of the tail fan of a lobster or the stinger of a scorpion.
The rearmost segment of the body of certain arthropods.
The terminal segment of the body of an arthropod or segmented worm.
That of a crustacean forming the middle lobe of the tail.