Spinosaurids

Part of speech: noun

Definitions

1. A family of large carnivorous dinosaurs characterized by elongated skulls and distinctive sail-like structures on their backs, known for their semi-aquatic lifestyle and fish-based diet
2. Predatory reptiles from the Mesozoic era notable for their crocodile-like snouts and tall neural spines forming a sail, believed to have hunted both on land and in water
3. Theropod dinosaurs distinguished by their long, narrow jaws filled with conical teeth and a dorsal sail, adapted for aquatic environments and piscivorous feeding habits

Etymology: Spinosaurids are a family of large, mostly semi-aquatic theropod dinosaurs of the Cretaceous period, named for their relative Spinosaurus, whose name means "spine lizard" in Greek. Its long, crocodile-like snout and conical teeth suggest a diet built largely on fish, and several members of the group had sail-like structures along the back. The "-id" ending is the standard zoological suffix for members of a family, so "spinosaurid" is simply a member of the Spinosaurinae or Spinosauridae group, formed by adding that suffix to the genus name. The plural form, "spinosaurids", follows the usual English rule of adding an "s" to refer to several such animals.