Definition: Any land or marine reptile of the order Testudines, characterised by a protective shell enclosing its body. See also tortoise.

Alright class, settle down and let’s take a peek, At what a “turtle” is, and what it does speak! The dictionary tells us, clear and bright, “A reptile grand, both day and night!” (Tap-tap-tap on the desk) "Testudines" is the order, you see, A group of creatures, wild and free! They’re land or in the ocean they reside, With a shell so strong, it's their trusty guide. It protects them well, from danger and strife, Like a little fortress, guarding their life! You might also hear, if you’ve studied with care, Of a “tortoise” too – a similar pair! (Point to the board) They're closely related, it’s true you know, But turtles and tortoises, let your knowledge grow! So remember this lesson, sweet and neat, A turtle's shell is a wondrous feat! Do you have any questions for me now?