Dairy is a category of milk and milk products made from the milk of cows, sheep and goats.
In some parts of the world, milk from other milk-producing animals may be included.
Eggs are often lumped in with dairy in North America, if only because they are kept in chillers next to the dairy in North American supermarkets.
People in Asia were also milk-drinkers. The Greeks saw drinking milk as something astonishing: one of their words for barbarians was "milk-drinkers" (galaktopotes).
Literature & Lore
The English word "dairy" was originally dey-ery. Dey meant a woman servant in Middle English.