What does carotenoid mean?
A carotenoid is any member of a large family of natural pigments responsible for many of the vivid yellow, orange, and red colors seen in plants, algae, and certain bacteria. Familiar examples include beta-carotene in carrots, lycopene in tomatoes, and lutein in leafy greens. Beyond providing color, carotenoids perform vital functions: they help plants absorb light energy during photosynthesis and protect tissues from damage by excess light. In animals and humans — who cannot synthesize carotenoids and must obtain them from food — several of them, notably beta-carotene, can be converted into vitamin A, making them nutritionally significant. The word is technical in register, appearing mainly in botany, food science, ophthalmology, and nutrition writing. It is frequently used attributively, as in 'carotenoid levels' or 'carotenoid pigments.' Understanding the term is useful for anyone reading about antioxidants, eye health, or the chemistry behind the color of fruits and vegetables.
nounAny of a class of yellow, orange, or red pigments found in plants and some other photosynthetic organisms, including carotenes and xanthophylls. Carotenoids play roles in photosynthesis and serve as precursors of vitamin A in animals.
- Any of a class of naturally occurring pigments (yellow to red) produced by plants and some microorganisms, important in photosynthesis and human nutrition as vitamin A precursors.
"The brilliant orange of the autumn leaves comes from carotenoids that were present all along but masked by chlorophyll."
"Lycopene, the pigment that makes tomatoes red, is one of the most studied dietary carotenoids."
"Researchers measured the carotenoid levels in the blood of participants who ate a diet rich in leafy greens."
Regular plural; the plural form is more common than the singular because the word typically refers to the class of pigments collectively.
"Brightly colored vegetables such as carrots and sweet potatoes are excellent sources of carotenoids."
Carotenoids are why flamingos are pink — they get them from the shrimp and algae they eat, since their bodies can't make these pigments themselves.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of carotenoid
Carotenoid derives from 'carotene', which itself comes from the Latin 'carota', meaning carrot — the vegetable from which the orange pigment was first isolated in the early 19th century. The suffix '-oid' is from Greek '-oeides', meaning 'resembling' or 'in the form of'. The term thus literally means 'carotene-like substance', coined when chemists recognized that carotene belonged to a wider class of related pigments. Its closest relatives are words built on the same root, such as 'carotene' itself and 'carrot'.
Related word forms
How carotenoid is actually used
Carotenoid is a technical term used chiefly in scientific, nutritional, and medical contexts; it is rarely encountered in everyday conversation. It is most often used attributively (e.g., 'carotenoid pigments') or in discussions of diet and health.
Easily confused with carotenoid
Carotene is a specific carotenoid (the orange pigment of carrots), whereas carotenoid is the broader class that includes both carotenes and xanthophylls.