belonging or pertaining to the order Chelonia, comprising the turtles.
a turtle.

1820–30; < Neo-Latin Cheloni(a) (< Greek chelṓn(ē) turtle + Neo-Latin -ia, neuter plural noun suffix) + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chelonian (kɪˈləʊnɪən)
1.  any reptile of the order Chelonia, including the tortoises and turtles, in which most of the body is enclosed in a protective bony capsule
2.  of, relating to, belonging to, or characteristic of the Chelonia
[C19: from New Latin Chelōnia, from Greek khelōnē tortoise]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
chelonian   (kĭ-lō'nē-ən)  Pronunciation Key 
Any of various reptiles of the order Chelonia (or Testudines), which includes the turtles and tortoises. Chelonians lack teeth and usually have a hard shell that protects the body and consists of bony plates fused to the vertebrae and ribs. Unlike all other living reptiles, the skulls of chelonians lack temporal openings, which is characteristic of the earliest known reptiles (called anapsids). Chelonians evolved during the late Permian or Triassic Period and have changed little since.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The hematological parameters measured in this study were considered to be within normal limits for a chelonian species.
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