Definition of "ennea" []

• A genus of pulmonate gastropods, or snails, of the family Helicidæ. (noun)
• A prefix in words of Greek origin, signifying ‘nine.’ (noun)

The Century Dictionary (Public Domain)

• "As an example, Latin novem, Greek ennea and Sanskrit navá all mean 'nine' and these three languages are known to be related to each other."
• "The reason of its name is obvious: “deca” is greek for ten, “ennea” for nine, and “cubita” are couches with curved ends; and on the day when Our Lord Jesus Christ was born according to the flesh nineteen covers are always laid here at the table."
• "32 B. 19 ennea would seem to be a slip of the pen for okto, eight."