blood sugar

noun

: the glucose in the blood

also : its concentration (as in milligrams per 100 milliliters)

Examples of blood sugar in a Sentence

As a diabetic, he needs his blood sugar to stay at the right levels.

Recent Examples on the Web

Meanwhile, carbs—the body’s primary energy source—increase your blood sugar, or blood glucose, and, in turn, trigger the pancreas to secrete insulin (a hormone that tells the body’s cells to absorb glucose to prevent an overload). —Caroline Tien, SELF, 9 Apr. 2026

But students also use phones in beneficial ways, such as monitoring their blood sugar levels, connecting with family and peers, and even contacting digital tip lines to prevent violence. —Brian Jacob, The Conversation, 9 Apr. 2026

After the fast-digesting version, blood sugar initially surged. —David S. Ludwig, STAT, 9 Apr. 2026

The key concept is called a glucose spike, a rapid rise in blood sugar after eating that typically peaks about 75 minutes after a meal. —Allison Palmer, Miami Herald, 8 Apr. 2026

Word History

First Known Use

1881, in the meaning defined above

Kids Definition

blood sugar

noun

: the glucose in the blood

especially : the amount or percentage of such sugar

Medical Definition

blood sugar

noun

: the glucose in the blood

also : its concentration (as in milligrams per 100 milliliters)