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The word chelonian is popular among veterinarians, scientists, and conservationists working with these animals as a catch-all name for any member of the superorder Chelonia, which includes all turtles living and extinct, as well as their immediate ancestors. Chelonia is based on the Greek word χελώνη chelone "tortoise", "turtle" , also denoting armor or interlocking shields; testudines, on the other hand, is based on the Latin word testudo "tortoise".[11] "Turtle" may either refer to the order as a whole, or to particular turtles that make up a form taxon that is not monophyletic.

The meaning of the word turtle differs from region to region. In North America, all chelonians are commonly called turtles, including terrapins and tortoises. In Great Britain, the word turtle is used for sea-dwelling species, but not for tortoises.

The term tortoise usually refers to any land-dwelling, non-swimming chelonian. Most land-dwelling chelonians are in the Testudinidae family, only one of the fourteen extant turtle families.

Terrapin is used to describe several species of small, edible, hard-shell turtles, typically those found in brackish waters, and is an Algonquian word for turtle.

Some languages do not have this distinction, as all of these are referred to by the same name. For example, in Spanish, the word tortuga is used for turtles, tortoises, and terrapins. A sea-dwelling turtle is tortuga marina, a freshwater species tortuga de río, and a tortoise tortuga terrestre.

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