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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Zoology) the last segment or an appendage on the last segment of the body of crustaceans and arachnids
[C19: from Greek: a boundary; probably related to telos end]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the last segment, or an appendage of the last segment, of certain arthropods, as the middle flipper of a lobster's tail.
[1850–55; < Greek télson boundary, limit]
tel•son′ic (-ˈsɒn ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.