Pertaining or relating to parts under the skin; subcutaneous; employed in introducing foreign substances under the skin: specifically applied to a mode of administering medicines by introducing them under the skin: as, a hypodermic syringe.Burrowing in or under the skin; infesting the integuments: as, a hypodermic insect.Of or pertaining to the hypoderm in arthropods: as, a hypodermic layer; hypodermic cells.n. In medicine, a remedy introduced under the skin, as morphia or other narcotic agent.n. A hypodermic injection or syringe.