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noun, Biochemistry.
any of a group of solid, mostly unsaturated, polycyclic alcohols, as cholesterol and ergosterol, derived from plants or animals.
(biochem) any of a group of natural steroid alcohols, such as cholesterol and ergosterol, that are waxy insoluble substances

sterol ster·ol (stěr’ôl’, -ōl’, stēr’-)
Any of a group of predominantly unsaturated solid alcohols of the steroid group, such as cholesterol and ergosterol, present in the fatty tissues of plants and animals.
Any of various alcohols having the structure of a steroid, usually with a hydroxyl group (OH) attached to the third carbon atom. Sterols are found in the tissues of animals, plants, fungi, and yeasts and include cholesterol.


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