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Glycosaminoglycan

Unbranched polysaccharide of alternating units of two different sugars.

Also: GAG

Long, negatively charged polysaccharides (e.g., heparan sulfate, chondroitin sulfate, hyaluronan) that form the carbohydrate component of proteoglycans in extracellular matrix.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Long, negatively charged polysaccharides (e.g., heparan sulfate, chondroitin sulfate, hyaluronan) that form the carbohydrate component of proteoglycans in extracellular matrix.

Related terms

Proteoglycans