sea·​weed ˈsē-ˌwēd How to pronounce seaweed (audio)
: a mass or growth of marine plants
: a plant growing in the sea
especially : a marine alga (such as a kelp)

Example Sentences

Recent Examples on the Web Redness doesn't stand a chance against Biossance's Squalane + Probiotic Gel Moisturizer, a gel-cream packed with red seaweed and ginger extract to soothe irritation and rosacea. Anamaria Glavan, Allure, 12 Oct. 2022 The story is set largely on the remote Korean island of Jeju, among the community of ‘haenyo,’ women who earn a living by free diving for mollusks, seaweed and other sea life from the depths of the ocean. Patrick Frater, Variety, 8 Oct. 2022 Sushi — typically made with fish, vegetables, seaweed and rice — is Japanese in origin, which is particularly noteworthy because the average life expectancy in Japan is 85 years compared to the life expectancy of 77 years in the U.S. Good Housekeeping, 24 Aug. 2022 To further elevate your bowl, bring your own toppings, like seaweed or garlic flakes. Matt Pawlik, Los Angeles Times, 19 Aug. 2022 Top menu choices include the roasted octopus with red mole and Lima-style causa, and the lobster tail with green papaya, seaweed and citrus vinaigrette. Isabelle Kliger, Forbes, 1 June 2022 After the first round, Cho might stop by himself to whip up a quick juk, or rice porridge, using the concentrated broth, stirred quickly tableside and finished amber orbs of salmon roe, toasted seaweed and optional bay shrimp or Dungeness crab. oregonlive, 26 May 2022 In recent years, scientists have been working on more environmentally-friendly alternatives, including sunscreens containing compounds from algae, seaweed and cyanobacteria. Margaret Osborne, Smithsonian Magazine, 12 May 2022 With seaweed and kelp extracts, this salt spray is basically a beach vacation in a bottle. ELLE, 23 Apr. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'seaweed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1577, in the meaning defined at sense 1

Time Traveler
The first known use of seaweed was in 1577

Dictionary Entries Near seaweed

Cite this Entry

“Seaweed.” Dictionary, Merriam-Webster, Accessed 27 Nov. 2022.

Kids Definition



sea·​weed -ˌwēd How to pronounce seaweed (audio)
: a plant growing in the sea
especially : a marine alga (as a kelp)

More from Merriam-Webster on seaweed

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
Spell It

Hear a word and type it out. How many can you get right?

Universal Daily Crossword

A daily challenge for crossword fanatics.