water-thyme
† 1. An (? imaginary) aquatic species of thyme.
| 1655 Walton Angler vi. (1661) 132 Some think that he [sc. the grayling] feeds on Water-Time, and smells so at his first taking out of the water. |
2. The American weed Elodea canadensis (formerly Anacharis Alsinastrum), now common in English waters.
| 1855 Anne Pratt Flower. Pl. V. 190 The Anacharis is called by the fishermen the Water Thyme. |