The Collaborative International Dictionary of English v.0.48:

Enthetic \En*thet"ic\ ([e^]n*th[e^]t"[i^]k), a. [Gr. 'enqetiko`s
   fit for inserting; 'en in + tiqe`nai to place.] (Med.)
   Caused by a pathogenic organism implanted in the system; as,
   an enthetic disease like syphilis.
   [1913 Webster]