seaweed /ˈsiːwiːd/ noun2 •Any of numerous marine algae, such as a kelp.We have lingered in the chambers of the sea / By sea-girls wreathed with seaweed red and brown / Till human voices wake us, and we drown. — 1915 •Any of various fresh water plants and algae.With light penetrating to the lake bottom, beds of seaweed flourished where little had grown before. — 1995 formsseaweeds
