Originally: a seaweed. In later use (chiefly in plural): any of a large, diverse group of chiefly aquatic organisms which are capable of…
Chiefly plural. Seaweed.
In plural. Marsh or water plants; seaweed. Obsolete.
A particular marine alga.
a plant of the Thalassiophyta (see quot. 1842); a seaweed, a marine alga.
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