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

Both peanuts and popcorn fit the bill, but peanuts will have a slightly smaller impact on blood sugar levels. — Mira Miller, Verywell Health, 21 Aug. 2026

When blood sugar levels reach a certain threshold, a cascade of hormonal responses tells the pancreas to release insulin, slow digestion, and put a hold on the breakdown of glucose stores. — Mike McRae 19, New Atlas, 20 Aug. 2026

The Centers for Disease Control and Prevention explains that having too much blood sugar in the bloodstream will overwhelm our liver and muscles that normally store blood sugar and cause the insulin in our bodies to store any excess in other places. — Audrey Noble, Vogue, 20 Aug. 2026

The deficiency ​reduces the liver’s ability to control glucose levels and is associated with potentially life-threatening low blood sugar levels. — Ed Silverman, STAT, 20 Aug. 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)