Webster's English Dictionary

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hypochondriasis

hy.po.chon.dri.a.sis \-'dri--*-s*s\ \-*-.se-z\ n or hy.po.chon.dri.a.ses 
   [NL, fr. hypochondria + -iasis] pl  : morbid concern about one's health 
   esp. when accompanied by delusions of  physical disease