Large plants that grow in the ocean, usually green, brown, or red in color.
From Old English 'sǽ' (sea) plus 'wēod' (weed, plant). Unlike terrestrial weeds, 'seaweed' refers to marine algae. The term 'weed' was applied because these plants were originally seen as less useful than fish, though modern science has revealed seaweed's nutritional and ecological importance.
Seaweed isn't actually a weed and isn't even a plant—it's algae, a completely different organism that evolves and grows so efficiently that some species double in size in just 24 hours, making it one of Earth's fastest-growing organisms!
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