Webster's English Dictionary

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hypochondria

hy.po.chon.dria \.hi--p*-'ka:n-dre--*\ n [NL, fr. LL, pl., upper abdomen 
   (formerly regarded as the seat of hypochondria)], fr. Gk, lit., the parts 
   under the cartilage (of the breastbone), fr. hypo- + chondros cartilage - 
   more at GRIND : extreme depression of mind or spirits often centered on 
   imaginary physic al ailments; specif : HYPOCHONDRIASIS