Pl. exencephali. [mod.L. exencephalus, f. Gr. ἐξ out + ἐγκέφαλος brain.] ‘I. G. St. Hilaire’s term for a monstrosity in which the brain lies wholly or chiefly outside the cranial cavity at the back of a very flattened head’ (Syd. Soc. Lex., 1884).
