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.
Print. The kneecap (the patella) is a triangular bone at the front of the knee. Several tendons and ligaments connect to the kneecap, including ones attached to the upper leg (femur) and lower leg (tibia) bones.rint. The kneecap (the patella) is a triangular bone at the front of the knee. Several tendons and ligaments connect to the kneecap, including ones attached to the upper leg (femur) and lower leg (tibia) bones.