psychosomatic UK /ˌsaɪkəʊsəˈmætɪk/US /ˌsaɪkoʊsəˈmædɪk/ adjective2 •Pertaining to physical diseases, symptoms, etc. which have mental causes. •(no longer used) Pertaining to both the mind and the body. formsmore psychosomatic · most psychosomatic