[mass noun] A yellow or brown carotenoid plant pigment which causes the autumn colours of leaves.
- ‘Remove both chlorophyll and the yellow pigment xanthophyll and the variegation is white.’
- ‘Concentrations of total carotenoids and total xanthophyll were greater for plants grown at low temperature.’
- ‘Retinal xanthophyll is a carotenoid, chemically related to vitamin A, whose absorption spectrum peaks at about 460 nm and ranges from 480 nm down to 390 nm.’
- ‘These are chlorophyll's shy cousins, the yellow pigment xanthophyll and the red-orange carotene.’
- ‘There is now an extensive literature based on in vivo and in vitro studies that deal with mechanistic aspects of xanthophyll pigment-dependent photoprotection.’
Mid 19th century: from Greek xanthos yellow + phullon leaf.
We take a look at several popular, though confusing, punctuation marks.