Penes.

[anda]

http://www.straightdope.com/mailbag/mplurals.html

All text, no ads, though possibly still NWS if your work is really picky.

Comments

[squidminion]

Wow... I usually find Straight Dope interesting even on weird topics, but I couldn't take three pages of Latin noun pluralization. Besides, as a non-mutated straight male, the need for a plural just doesn't come up all that often. :-)

[anda]

As an ex-Latin dork, it interested me.

Of course, I already knew the answer. ;)

[catblade]

I've added you as a friend.

Hopefully I will be capable of getting all the way through a go game with you tomorrow. I really appreciate your teaching last week. I think you might have made me slightly smarter... ;)