| n. | 1. | (Bot.) A plant (Zostera marina), with very long and narrow leaves, growing abundantly in shallow bays along the North Atlantic coast. |
| Noun | 1. | eelgrass - submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts |
| 2. | eelgrass - submerged aquatic plant with ribbonlike leaves; Old World and Australia |