Definition

1. Noun:
   • A substance used to curdle milk: "rennet" is a natural complex of enzymes, traditionally obtained from the stomach lining of young ruminant mammals (such as calves), that causes milk to separate into solid curds and liquid whey. This process is essential in cheesemaking and the production of certain dairy desserts.

Usage

• Primary Use: "Rennet" is used almost exclusively in the context of food production, specifically dairy processing.
• Grammatical Role: It functions as a non-count (mass) noun when referring to the substance in general. It can be used as a count noun when referring to types or specific preparations (e.g., "animal rennet," "microbial rennets").

Examples

• Noun:
  • Traditional cheese is often made using animal rennet.
  • The recipe calls for a few drops of liquid rennet to coagulate the milk.
  • Vegetarian alternatives to rennet are now widely available.

Advanced Usage

• "Rennet stomach": Refers to the fourth stomach (abomasum) of a young calf, which is the source of traditional rennet.
  • The rennet stomach is harvested to produce the enzyme chymosin.
• "Rennet casein": A type of casein protein precipitated from milk by rennet, used in industrial food applications.
  • Rennet casein is a key ingredient in some processed cheese products.

Variants and Related Words

• Rennin (n): An older, less precise synonym for the key enzyme (chymosin) in rennet. Note: "Rennin" is sometimes used interchangeably with "rennet," but "rennet" refers to the complete preparation, while "chymosin" is the specific enzyme.
• Chymosin (n): The specific protease enzyme, primarily responsible for milk coagulation, found in rennet.
• Coagulant (n): A general term for any substance that causes coagulation; rennet is a type of milk coagulant.
• Junket (n): A dessert made of sweetened, flavored milk curdled with rennet.

Synonyms

• Milk coagulant: A general term for any substance that curdles milk.
• Curdling agent: A descriptive synonym emphasizing the function.

Notes on Different Meanings

• Botanical Context: In a completely separate and less common usage, "rennet" can also refer to a type of apple (e.g., a rennet apple), used historically for making cider. This meaning is unrelated to the dairy context.
  • Example: The orchard grows several old varieties, including the rennet.

Noun

1. a substance that curdles milk in making cheese and junket