elbow: hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped
hinge joint: a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane
alpha-linolenic acid: a polyunsaturated fatty acid with 18 carbon atoms; the only omega-3 fatty acid found in vegetable products; it is most abundant in canola oil; a fatty acid essential for nutrition