The Collaborative International Dictionary of English v.0.48:

Subcutaneous \Sub`cu*ta"ne*ous\, a.
   Situated under the skin; hypodermic. --
   Sub`cu*ta"ne*ous*ly, adv.
   [1913 Webster]

   Subcutaneous operation (Surg.), an operation performed
      without opening that part of the skin opposite to, or
      over, the internal section.
      [1913 Webster]

WordNet (r) 3.0 (2006):

subcutaneous
    adj 1: relating to or located below the epidermis; "hypodermic
           needle"; "subcutaneous implant" [syn: hypodermic,
           subcutaneous]