1 Hydrogen is the most abundant element in the universe. 2  Hydrogen isn't common in a pure form on Earth, but is mostly found as part of water. 3  Hydrogen is the main fuel of stars and the only fuel for red dwarfs. 4  The whole universe is thought to have been formed by a Hydrogen nucleus.
Noun. 1. hindlimb-a posterior appendage such as a leg or the homologous structure in other animals. hind limb. hind leg-the back limb of a quadruped. limb-one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper. 1  Facebook.
What is it? The patella is the small, bony plate (the kneecap) that protects the knee joint in people, where the femur and tibia meet. In horses, this joint is known as the stifle. A unique hooking of the patellar ligaments over a notch on the femur allows the horse to lock its hind legs in the standing position.