[ne-] or neo- comb form [Gk, fr. neos new--more at new] 1 a: new: recent "Neogene" b: new and different period or form of "Neoplatonism": in a new and different form or manner "Neoplatonic" c: New World "Neotropical" d: new and abnormal "neoplasm"
2: new chemical compound isomeric with or otherwise related to (such) a compound "neostigmine"