The Collaborative International Dictionary of English v.0.48:

echinococcosis \e*chi"no*coc*co`sis\
   ([e^]*k[imac]"n[-o]*k[o^]k*k[=o]`s[i^]s), n. (Med.)
   infestation with echinococci (tapeworms). An infection with
   the larval form is called hydatid disease.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

echinococcosis
    n 1: infestation with larval echinococci (tapeworms) [syn:
         echinococcosis, hydatid disease, hydatidosis]