What does hydrolyzed mean?
Hydrolyzed describes a substance that has been chemically broken down through hydrolysis, a process in which a reaction with water splits a larger molecule into smaller components. The word commonly appears in food labeling, biochemistry, and materials science, as in “hydrolyzed protein,” “hydrolyzed starch,” and “hydrolyzed collagen.” In technical contexts, the term can indicate that water participated directly in the chemical reaction; in consumer products, it usually indicates that a complex ingredient has been deliberately processed into smaller, more soluble components. The form can function either as a verb form—meaning “was broken down by hydrolysis”—or as an adjective modifying a substance that has undergone this treatment. The spelling is standard in US English, while “hydrolysed” is the traditional British variant. The word is technical in origin but familiar because hydrolyzed ingredients are widely listed on packaged foods and dietary-supplement labels.
To split a substance into smaller components through hydrolysis.
"Heat and enzymes hydrolyzed the starch into simple sugars."
Usually used in the past tense or past participle, either as a finite verb or as part of a passive construction.
Having been broken down into smaller components by hydrolysis.
"The label lists hydrolyzed soy protein as an ingredient."
This attributive use is especially common on food, supplement, and industrial-material labels.
Hydrolyzed sounds like a chemical transformation, but it is often the label on everyday foods whose complex ingredients have been deliberately broken down with water.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hydrolyzed come from?
The word derives from the combining form “hydro-,” from Greek hudor, meaning “water,” and the New Latin suffix “-lysis,” from Greek luein, meaning “to loosen” or “to dissolve.” Together, these elements express the splitting of a substance by water. The related noun “hydrolysis” names the chemical process itself, while “hydrolytic” describes something involving or caused by hydrolysis. The -ized form follows the productive English pattern of turning a noun into a verb and then into a participial adjective.
Related word forms
How hydrolyzed is actually used
In technical and commercial writing, “hydrolyzed” commonly appears before the name of the substance being broken down. The US spelling is “hydrolyzed”; British English traditionally uses “hydrolysed,” although the -ized form is also encountered.
Easily confused with hydrolyzed
“Hydrolyzed” is the usual US spelling, while “hydrolysed” is the traditional British spelling of the same word.