Most creatures known as sea slugs are actually snails, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary time have lost their shells, or have a greatly reduced shell or an internal shell. sea cucumber also looks slug-like and is sometimes loosely called a sea slug, but it is not a gastropod. Sea slug is a common name which is applied to some marine invertebrates that more or less resemble terrestrial slugs.
Medical Definition of VERTEBRA. : any of the bony or cartilaginous segments that make up the spinal column and that have a short more or less cylindrical body whose ends articulate by pads of elastic or cartilaginous tissue with those of adjacent vertebrae and a bony arch that encloses the spinal cord.ord Root of VERTEBRA. The Latin word vertere, meaning â to turn â or â to change, â and its form versus give us the roots vert and vers. Words from the Latin vertere have something to do with turning or changing.
Medical Definition of hip. 1  1: the laterally projecting region of each side of the lower or posterior part of the mammalian trunk formed by the lateral parts of the pelvis and upper part of the femur together with the fleshy parts covering them. 2  2: hip joint.