agyriaEtymologyFrom Ancient Greek ἀ- (a-, “not, without”) + γῦρος (gûros, “ring, circle”).agyria means the smooth appearance of the brain in cases of lissencephaly. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounThe smooth appearance of the brain in cases of lissencephaly.