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Please note that the correct word is "organomegaly"
Explanation: -- you need the mid "o".
See this reference in PubMed: Belec L. Salmon-Ceron D. Blanche P. Dreyfus F. Zuber M. Sicard D. [POEMS syndrome (Polyneuropathy, Organomegaly , Endocrinopathy, Monoclonal gammopathy, Skin changes), multicentric Castleman disease, renal chromophobe carcinoma and herpes virus type 8 infection (letter; comment)]. Annales de Pathologie. 19(4):373-4, 1999 Sep.