- any plant or plants growing in the ocean.
- a marine alga.
Origin of seaweed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for seaweed
Poudre de Neptune (dill, fennel, star anise, seaweed) is by far the most-used seasoning in my kitchen.A Superstar Chef Does the Unthinkable
November 17, 2008
As a last resort this seaweed is edible, at any rate certain species of it.
Ahead of them the seaweed stretched, apparently all the way to the schooner.
It was the seaweed spray of this seaweed ocean that had whipped him during the night.
Nearly every dash of foam brought with it biting bits of seaweed now.
On the beach, there was quite a movement, but that might be seaweed rocked by the tide.The Fte At Coqueville
- any of numerous multicellular marine algae that grow on the seashore, in salt marshes, in brackish water, or submerged in the ocean
- any of certain other plants that grow in or close to the sea
Word Origin and History for seaweed
Online Etymology Dictionary, © 2010 Douglas Harper
- Any of various red, green, or brown algae that live in ocean waters. Some species of seaweed are free-floating, while others are attached to the ocean bottom. Seaweed range from the size of a pinhead to having large fronds (such as those of many kelps) that can be as much as 30.5 m (100 ft) in length. Certain species are used for food (such as nori) and fertilizer, and others are harvested for carrageenan and other substances used as thickening, stabilizing, emulsifying, or suspending agents in industrial, pharmaceutical, and food products. Seaweed is also a natural source of the element iodine, which is otherwise found only in very small amounts. See more at brown alga green alga red alga.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.