Final answer:
The term 'Subcutaneous' refers to anything related to the layer of tissue found directly under the skin.
Step-by-step explanation:
The word that means pertaining to under the skin is Subcutaneous.
This term is often used to describe a layer of tissue beneath the skin, specifically the subcutaneous tissue or hypodermis, which is composed of fat and connective tissue that attaches the dermis to the underlying bone and muscle. The hypodermis, also known for energy storage and insulation, contains blood vessels and sensory neuron axons supplying the dermis above it.