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.
reciprocal apparatus. consists of two tendinous cords in the hindlimb of the horse, the peroneus tertius and the superficial flexor, which connect the distal end of the femur to the hock, one on the cranial face of the tibia, the other on the caudal face; they ensure that the two joints always move in unison.