| var. of neo- esp. before a vowel: neencephalon. |
| 1. | a combining form meaning “new,” “recent,” “revived,” “modified,” used in the formation of compound words: neo-Darwinism; Neolithic; neoorthodoxy; neophyte. |
| 2. | Chemistry. a combining form used in the names of isomers having a carbon atom attached to four carbon atoms: neoarsphenamine. |
neo- pref.
New; recent: neonatal.
New and different: Neo-Freudian.
New and abnormal: neoplasm.