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seaweed

[see-weed] /ˈsiˌwid/
noun
1.
any plant or plants growing in the ocean.
2.
a marine alga.
Origin of seaweed
1570-1580
First recorded in 1570-80; sea + weed1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for seaweed
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Historical Examples
  • As a last resort this seaweed is edible, at any rate certain species of it.

    The Cruise of the Dry Dock T. S. Stribling
  • Ahead of them the seaweed stretched, apparently all the way to the schooner.

    The Cruise of the Dry Dock T. S. Stribling
  • Nearly every dash of foam brought with it biting bits of seaweed now.

    The Cruise of the Dry Dock T. S. Stribling
  • It was the seaweed spray of this seaweed ocean that had whipped him during the night.

    The Cruise of the Dry Dock T. S. Stribling
  • On the beach, there was quite a movement, but that might be seaweed rocked by the tide.

  • I can sprawl on that seaweed and be as comfortable as a gull on a clam flat.

    Fair Harbor

    Joseph Crosby Lincoln
  • But to haul you along on a load of seaweed that's goin' to bed down a hog!

    Fair Harbor

    Joseph Crosby Lincoln
  • The fire had burned until it reached this seaweed and then had gone no further.

    Cap'n Eri Joseph Crosby Lincoln
  • Two-thirds of the line was off the reel, and the piece of seaweed seemed to be a drag on the fish.

    Tales of Fishes Zane Grey
British Dictionary definitions for seaweed

seaweed

/ˈsiːˌwiːd/
noun
1.
any of numerous multicellular marine algae that grow on the seashore, in salt marshes, in brackish water, or submerged in the ocean
2.
any of certain other plants that grow in or close to the sea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for seaweed
n.

1570s, from sea + weed (n.). An Old English word for it was sæwar.

Online Etymology Dictionary, © 2010 Douglas Harper
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seaweed in Science
seaweed
  (sē'wēd')   

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 © 2002. Published by Houghton Mifflin. All rights reserved.
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