from The American Heritage® Dictionary of the English Language, 4th Edition
- n.pl. A throw of two dice that turns up one spot on each.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. two ones, after rolling two dice.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. expressions used when when two dice are thrown and both come up showing one spot
From the resemblance of the two single pips to the eyes of a snake. (Wiktionary)