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subcutaneous layer

sub·cu·ta·ne·ous lay·er

/ˌsəbkyo͞oˈtānēəs ˈlāər/

Noun

Beneath the dermis, this layer of skin is made of mostly fat cells. In addition to providing addition protection against blunt forces, this layer helps to insulate the body against heat loss as well as control water loss through evaporation.