Definition: A scaleless, predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.

Alright class, settle down now, let’s take a look! Today we're diving deep – it’s true – To learn about a creature, sleek and new. The dictionary tells us, clear and bright, What “shark” really means with all its might! (Pause for dramatic effect) It says, "A scaleless, predatory fish, Of the Selachimorpha, quite a stylish wish!" Now that’s a mouthful, isn’t it dear? Let's break it down with cheer: Scaleless: No scales to hide, you see, Their skin is smooth – as sleek as can be! Predatory Fish: They hunt and they chase, A tasty meal in a watery space. Superorder Selachimorpha: This is the group, don’t you know, Of sharks and rays, putting on quite a show! Cartilaginous Skeleton: Not bone like yours and mine, But cartilage – flexible and fine! 5 to 7 Gill Slits: On either side, you see, These openings help them breathe so free! So there you have it, a detailed decree, The meaning of "shark," for all to agree! Do you have any questions? Don't be shy, Let’s talk about these creatures beneath the sky – or sea!