red tide

noun

Definition of red tide

: seawater discolored by the presence of large numbers of dinoflagellates (as of the genera Karenia, Gymnodinium, and Alexandrium) which typically produce a toxin poisonous especially to many forms of marine vertebrate life and to humans who consume contaminated shellfish — compare saxitoxin

Examples of red tide in a Sentence

Recent Examples on the Web

Statistics from the Florida Fish and Wildlife Conservation Commission say that red tide is to blame for at least 97 manatee deaths. Tamara Lush, The Seattle Times, "In first 8 months of year, manatee death toll surpasses 2017," 20 Aug. 2018 Officials are now trying to figure out why this year's red tide is so intense. Travis Fedschun, Fox News, "Red tide along Florida's Gulf Coast leads Gov. Scott to declare state of emergency," 15 Aug. 2018 The blue-green algae is different from the red tide algae bloom that has devastated marine life on Florida’s Gulf Coast. James Rogers, Fox News, "Blue-green toxic algae invades Florida river," 15 Aug. 2018 An aerial view of the red tide bloom off Manasota Beach on Wednesday shows the vastness of the affected area. Maya Sweedler, WSJ, "Florida’s Red Tide Stings Tourist Industry," 15 Aug. 2018 People have posted pictures to social media of the gruesome effects of red tide. Chris Ciaccia, Fox News, "WARNING GRAPHIC IMAGES: Dead fish, turtles, manatees wash up on southwest Florida beaches," 3 Aug. 2018 In Sarasota County, 11 dead dolphins have been found and marine biologists are investigating if their deaths are linked to red tide, according to FOX13. Travis Fedschun, Fox News, "Red tide along Florida's Gulf Coast leads Gov. Scott to declare state of emergency," 15 Aug. 2018 More than 100 tons of dead fish have washed up on the shores of southwest Florida as a result of a natural disaster known as red tide. Jewel Wicker, Teen Vogue, "Florida’s Red Tide is Killing Hundreds of Sea Animals," 16 Aug. 2018 Modern major fish kills caused by red tides were first identified back in 1844. David Grossman, Popular Mechanics, "What Are Red Tides and Why Are They Getting Worse?," 14 Aug. 2018

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

See More

First Known Use of red tide

1904, in the meaning defined above

Keep scrolling for more

Learn More about red tide

Statistics for red tide

Last Updated

12 Jan 2019

Look-up Popularity

Time Traveler for red tide

The first known use of red tide was in 1904

See more words from the same year

Keep scrolling for more

More Definitions for red tide

red tide

noun

Medical Definition of red tide

: a large area of seawater discolored by the presence of large numbers of dinoflagellates (as of the genera Karenia, Gymnodinium, and Alexandrium) which typically produce toxins poisonous especially to many forms of vertebrate marine life and to humans who consume contaminated shellfish In simple terms, a red tide is a dinoflagellate population explosion, caused when certain species “bloom,” or multiply many times faster than usual.— Ellen Girardeau, Calypso Log Dispatch, October 1984 Red tides, the blooms of toxic Karenia brevis algae that appear almost every year in Florida, often lasting for months and turning the ocean red, may be dangerous to asthma sufferers—even if they don't go swimming.— Nicholas Bakalar, The New York Times, 16 Jan. 2007 — see brevetoxin, saxitoxin, shellfish poisoning

More from Merriam-Webster on red tide

Rhyming Dictionary: Words that rhyme with red tide

Britannica.com: Encyclopedia article about red tide

Comments on red tide

What made you want to look up red tide? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

tremendous in size, volume, or degree

Get Word of the Day daily email!

Test Your Vocabulary

Homophone Quiz

  • three-bears-two-of-them-look-like-theyre-whispering-to-a-third-bear-who-looks-chuffed-to-be-the-center-of-attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

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