Seaweed

//ˈsiwid// noun

Definitions

Noun
  1. 1
    Any of numerous marine algae, such as a kelp. uncountable, usually

    "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."

  2. 2
    plant growing in the sea, especially marine algae wordnet
  3. 3
    Any of various fresh water plants and algae. broadly, uncountable, usually

    "With light penetrating to the lake bottom, beds of seaweed flourished where little had grown before."

Etymology

From sea + weed.

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