Any one of a genus (Gentiana) of herbaceous plants with opposite leaves and a tubular four- or five-lobed corolla, usually blue, but sometimes white, yellow, or red. See Illust. of Capsule.
- Any of numerous plants of the genus Gentiana, characteristically having showy, variously colored flowers.
- The dried rhizome and roots of a yellow-flowered European gentian, G. lutea, sometimes used as a tonic.