Situated beneath the skin, in general; subdermal; lying in the true skin or cutis, under the cuticle; subcuticular; placed or performed under the skin; hypodermic: as, a subcutaneous injection.Fitted for use under the skin; hypodermic: as, a subcutaneous syringe; a subcutaneous saw.Living under the skin; burrowing in the skin: as, a subcutaneous parasitic insect.