| Birthroot | n. (Bot.) An herbaceous plant (Trillium erectum), and its astringent rootstock, which is said to have medicinal properties. [ 1913 Webster ] |
| purple trillium | (n) trillium of eastern North America having malodorous pink to purple flowers and an astringent root used in folk medicine especially to ease childbirth, Syn. birthroot, red trillium, Trillium erectum |