From The Collaborative International Dictionary of English v.0.48 [gcide]:
Acephalocyst \A*ceph"a*lo*cyst\, noun [Gr. 'ake'falos without a head + ky'stis bladder.] (Zool.) A larval entozo["o]n 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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