subcutis
noun
sub·cu·tis ˌsəb-ˈkyü-təs 
: the deeper part of the dermis
Example Sentences
Recent Examples on the Web He was diagnosed with subcutaneous emphysema - a rare condition in which air gets trapped under the skin's lowest layer called the subcutis or hypodermis. 
The Washington Post, OregonLive.com, 1 June 2018
The Washington Post, OregonLive.com, 1 June 2018 Word History
Etymology
New Latin, from Late Latin, beneath the skin, from Latin sub- + cutis
First Known Use
1877, in the meaning defined above
Medical Definition
subcutis
noun
sub·cu·tis ˌsəb-ˈkyüt-əs, ˈsəb-
: superficial fascia