What does carbohydrate mean?
A carbohydrate is one of the fundamental classes of biological molecules: an organic compound made of carbon, hydrogen, and oxygen, typically in ratios that once led chemists to describe them as 'hydrates of carbon.' Carbohydrates range from simple sugars such as glucose and table sugar to complex starches and structural fibers like cellulose. In everyday language, the word appears most often in discussions of food and health, where carbohydrates are treated as the body's main source of quick energy — bread, pasta, rice, and potatoes being familiar examples. The term is standard in both scientific and nutritional registers, though in casual speech it shortens to 'carbs.' Nutritionists commonly distinguish 'complex' carbohydrates, such as whole grains, which digest slowly, from 'simple' ones like sugar, which raise blood glucose rapidly. Understanding the word is essential for reading food labels, following dietary advice, and grasping basic biochemistry.
nounAny of a large group of organic compounds containing carbon, hydrogen, and oxygen — including sugars, starches, and cellulose — that serve as a major source of energy in the diet of living organisms.
- A chemical compound of carbon, hydrogen, and oxygen — such as glucose, sucrose, starch, or cellulose — classified chemically as a saccharide.
- (In nutrition and everyday use) A food group or dietary component consisting of sugars and starches, regarded as the body's principal source of energy.
"Athletes often load up on carbohydrate-rich pasta the night before a long race."
"Bread, rice, and potatoes are all staple foods rich in carbohydrate."
"The nutrition label lists total carbohydrates, including fiber and sugars, per serving."
Both singular and plural forms are common; the plural is especially frequent when referring to foods or dietary categories collectively ('foods high in carbohydrates').
"Whole grains provide more sustained energy than refined carbohydrates."
"Carbohydrate" literally means "hydrated carbon" — the name was coined in the 1800s because early chemists thought these compounds were made of carbon plus water.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of carbohydrate
The word carbohydrate was coined by chemists in the mid-nineteenth century, combining 'carbo-' (from Latin carbo, meaning coal or charcoal) with '-hydrate,' reflecting the observation that these compounds contain hydrogen and oxygen in roughly the same two-to-one ratio as water. The underlying element 'hydr-' traces back to Greek hydōr, meaning water, the same root that gives us hydrogen, hydrate, and dehydrate. The Latin root carbo likewise survives in related terms such as carbon and carbonic acid. The name proved slightly misleading, since not all carbohydrates have exact water proportions, but it became firmly established as the standard scientific term.
Related word forms
How carbohydrate is actually used
The word belongs chiefly to chemistry and nutrition writing; it is neutral in tone but frequently carries connotations of dieting culture, where 'low-carb' implies weight loss and 'carbs' (the informal short form) is often used loosely for starchy foods.
Easily confused with carbohydrate
A carbonate is a salt or ester of carbonic acid (as in calcium carbonate in limestone), whereas a carbohydrate is an energy-yielding sugar or starch composed of carbon, hydrogen, and oxygen.