Medicinerare(a) n. a fetus with complete absence of the brain;(b) adj. lacking the entire brain.Apparently only attested in dictionaries or glossaries.
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1890 G. M. GouldNew Med. Dict. 326/1Pantanencephalic,..a fœtal monstrosity destitute of brain.
1900 G. M. GouldIllustr. Dict. Med., Biol. & Allied Sci. (ed. 5) 967/1Pantanencephalic, congenitally destitute of brain.