Pronunciation: mi'ra-sid'e-um, -a
Definition: 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.
[G. meirakidion, boy]
See Also: sporocyst1
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Examples: glitazone, GI cocktail, etc.