The building blocks of English

Affixes

ennea-

Nine.

Greek ennea, nine.

An enneagram is a nine-sided figure used in one system of analysis to represent the spectrum of possible personality types; an enneagon (Greek ‑gōnos, angled) is a nine-sided plane figure; an enneahedron (Greek hedra, seat, base) is a solid figure having nine faces; ennead is a group or set of nine. See also nona‑ and the entry Number words.