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n.1.(Zool.) A larval entozoön in the form of a subglobular or oval vesicle, or hydatid, filled with fluid, sometimes found in the tissues of man and the lower animals; - so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts of different origin.
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Virchow speculated that the protoscolices may have perished in the smaller vesicles or been transformed into a cystic form, which he called acephalocysts.