dairy

dai‧ry /ˈdeəri $ ˈderi/ BrE AmE noun (plural dairies) [countable]
[Date: 1200-1300; Origin: dey 'female servant (in a dairy)' (10-19 centuries), from Old English dæge 'maker of bread']
1. a place on a farm where milk is kept and butter and cheese are made
2. a company which sells milk and sometimes makes other things from milk, such as cheese
3. dairy products/produce milk, butter, cheese etc

Oxford Advanced Learner's Dictionary

adjective only before noun
1. made from milk

• dairy products/produce

2. connected with the production of milk rather than meat
• the dairy industry
• dairy cattle/farmers
• a dairy cow/farm
Word Origin:

Middle English deierie, from deie ‘dairymaid’ (in Old English dǣge ‘female servant’), of Germanic origin; related to Old Norse deigja, also to dough and to the second element of Old English hlǣfdige (see lady).

Cambridge Advanced Learner's Dictionary

dairy / ˈdeə.ri / / ˈder.i / adjective

B2 used to refer to cows that are used for producing milk, rather than meat, or to foods that are made from milk, such as cream, butter, and cheese:

dairy cattle

dairy farmers

dairy products

Collins Advanced Learner’s English Dictionary

dairy

[de͟əri]
dairies
1) N-COUNT A dairy is a shop or company that sells milk and food made from milk, such as butter, cream, and cheese.
2) N-COUNT On a farm, the dairy is the building where milk is kept or where cream, butter, and cheese are made.
3) ADJ: ADJ n Dairy is used to refer to foods such as butter and cheese that are made from milk.
  ...dairy produce.
  ...vitamins found in eggs, meat and dairy products.
4) ADJ: ADJ n Dairy is used to refer to the use of cattle to produce milk rather than meat.
  ...a small vegetable and dairy farm.
  ...the feeding of dairy cows.

Merriam-Webster's Advanced Learner's Dictionary

dairy

²dairy adj always used before a noun
1 : made from milk
• dairy products/foods such as cheese and ice cream : relating to foods made from milk
• You'll find yogurt in the dairy section of the grocery store.
2 : of or relating to a type of farming that deals with the production of milk and foods made from milk
• dairy farms/farmers
• dairy cows/cattle [=cows that are raised to produce milk]
• the dairy industry