• Webster's Revised Unabridged Dictionary
    • n Telson (Zoöl) The terminal joint or movable piece at the end of the abdomen of Crustacea and other articulates. See Thoracostraca.
    • ***
Century Dictionary and Cyclopedia
    • n telson In zoology, the last segment, or an azygous appendage of the last segment, or the median axis of the last segment, whether in one piece or more, of certain crustaceans and arachmidans, as the middle flipper of a lobster's tail-fin, the long sharp tail of a horseshoe-crab, and the sting of a scorpion. In long-tailed crustaceans a broad flat telson combines with similar swimmerets to form the rhipidura. In some thysanurous insects the telson is a small plate at the end of the abdomen, and is either a modified segment or, more probably, a median azygous appendage. See cuts under Amphithoë, Eurypterida, horseshoe-crab, scorpion, and Squillidæ.
    • ***
Chambers's Twentieth Century Dictionary
    • n Telson tel′son the last somite of the pleon or abdomen of certain crustaceans and arachnidans.
    • ***


Webster's Revised Unabridged Dictionary
NL., fr. Gr. a boundary, limit
Chambers's Twentieth Century Dictionary
Gr. telson, a boundary.


In literature:

Telson and I will row you; eh, Telson?
"The Willoughby Captains" by Talbot Baines Reed
The eleventh abdominal segment is the telson, usually small and soft; it carries the anus.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6" by Various
The telson is often absent, or, rather, it is coalesced with the last somite of the abdomen.
"The Life of Crustacea" by William Thomas Calman

In news:

Veronica Gil, support engineer at Telson , works with Front Porch Digital's DIVArchive for its multisite operation.
Spanish audiovisual services provider Telson has installed a second Front Porch Digital DIVArchive system in Madrid.