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Definition of Miracidium
1. [n -DIA]
Medical Definition of Miracidium
1. The ciliated first-stage larva of a trematode that emerges from the egg and must penetrate into the tissues of an appropriate intermediate host snail if it is to continue its life cycle; followed by development into a mother sporocyst and by production of a number of offspring of successive larval generations. See: sporocyst. Origin: G. Meirakidion, boy (05 Mar 2000)