- a flowering plant (Zostera marina) of the pondweed family, that grows underwater and has long, grasslike leaves
- tape grass
- Any of several submersed marine plants of the genus Zostera, having straplike leaves and found along northern and southern temperate coasts worldwide.
- Any of several submersed freshwater plants of the genus Vallisneria, having long flat or twisted leaves and often grown as aquarium plants. Also called tape grass . Also called wild celery .
(countable and uncountable, plural eelgrasses)
- A plant (Zostera marina), with very long and narrow leaves, growing abundantly in shallow bays along the North Atlantic coast.