noun. any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances.
1. Noun, singular or mass Beta-sitosterol is a plant sterol -- a chemical found in all plant foods -- that appears to offer a number of health benefits. 2. Verb, base form Although allergies to plant sterols are rare, at least one team of dermatologists has found a case of allergic reaction to sterol supplements. 3. Adjective According to the Iowa State Integrated Crop Management website, triazole fungicides inhibit sterol production, which causes abnormal cell growth in the fungus, and it fails to thrive.