The huge mammary glands of a cow. On four legged cows udders have four teats. On two legged cows udders have two teats (or in the case of the two-legged variety the teats are more often called nipples).
The farmer felt kind of embarrassed the first time he touched the cow's udder to get milk, but as soon as he got used to it, he would go so far as to pull his baby daughter off the udder to get some of his own.
by La Leche July 11, 2006