Sugar of milk, also known as lactose, is a disaccharide sugar found naturally in milk. It is commonly used as an ingredient in various food products and is often added to beverages for its sweetening properties. In terms of synonyms, lactose can also be referred to as milk sugar or lactobiose. It's worth noting that lactose can be difficult for some individuals to digest, particularly those with lactose intolerance. Therefore, alternative sweeteners such as stevia, honey, or maple syrup may be used instead of sugar of milk in products designed for a wider audience.