Meaning of lectin: A complex molecule that has both protein and sugars.
Definition of lectin
A complex molecule that has both protein and sugars. Lectins are able to bind to the outside of a cell and cause biochemical changes in it. Lectins are made by both animals and plants.
Written and maintained by James Murray· Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.
For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.