microcephalismPath.|maɪkrəʊˈsɛfəlɪz(ə)m| [f.mod.L. mīcrocephal-us(see microcephalus) + -ism.] = microcephaly. 1861N. Syd. Soc.Year-bk.Med. 2 Memoir on Microcephalism.1879tr.De Quatrefages' Hum. Spec. 111 Microcephalism, idiotcy, and crétinism constitute so many teratological or pathological states.