ˈriver-weed
[f. river n.1 + weed n.]
1. A weed naturally growing in rivers.
| 1671 Skinner Etym. Bot., River-weed, Conferva Plinii. 1704 Dict. Rust. s.v. Sea, Sea and River Weeds. 1805 R. W. Dickson Pract. Agric. II. 643 The dung of rabbits, pigeons, and poultry,..river weeds, and other similar matters. 1895 Jrnl. R. Agric. Soc. Mar. 12 He..advised river-weeds and sedge as a manure for them. |
2. An American aquatic plant, the threadfoot (Podostemon ceratophyllus).
| 1856 A. Gray Man. Bot. (1860) 384 Podostemon, River⁓weed. Ibid., Podostemaceæ, River-weed Family. |