plica
noun
pli·ca ˈplī-kə 
plural plicae ˈplī-ˌkē
-ˌsē
: a fold or folded part
especially : a groove or fold of skin
Word History
Etymology
borrowed from Medieval Latin, "fold, ply," derivative of Latin plicāre "to fold, bend" — more at ply entry 3
First Known Use
circa 1660, in the meaning defined above
Medical Definition
plica
noun
pli·ca ˈplī-kə
plural plicae -ˌkē -ˌsē
-ˌsē : a fold or folded part
especially : a groove or fold of skin