red tide: meaning, definition, pronunciation and examples
Low-medium (specialized term, common in environmental/coastal news)Formal, Scientific, Journalistic
Quick answer
What does “red tide” mean?
A harmful algal bloom (HAB) in coastal waters where certain species of algae, often dinoflagellates, reproduce rapidly, creating discolored water (often reddish-brown) and producing toxins that can kill fish and marine mammals and cause illness in humans.
Audio
Pronunciation
Definition
Meaning and Definition
A harmful algal bloom (HAB) in coastal waters where certain species of algae, often dinoflagellates, reproduce rapidly, creating discolored water (often reddish-brown) and producing toxins that can kill fish and marine mammals and cause illness in humans.
Metaphorically used to describe any sudden, overwhelming, and destructive phenomenon that spreads rapidly and has negative consequences.
Dialectal Variation
British vs American Usage
Differences
Term is used identically in both varieties. 'Harmful algal bloom' (HAB) is the more formal scientific term.
Connotations
Conveys a sense of ecological danger, public health risk, and economic impact on fisheries and tourism.
Frequency
Slightly more frequent in American English due to prominent occurrences in the Gulf of Mexico and along Florida and California coasts.
Grammar
How to Use “red tide” in a Sentence
A red tide has occurred [PLACE].[PLACE] is experiencing/battling a red tide.The red tide has killed [MARINE LIFE].The red tide was caused by [FACTOR].Vocabulary
Collocations
Examples
Examples of “red tide” in a Sentence
adjective
British English
- red-tide conditions
- red-tide monitoring
American English
- red-tide conditions
- red-tide alert
Usage
Meaning in Context
Business
The red tide has forced the closure of shellfish beds and devastated the local fishing industry.
Academic
Research indicates that nutrient runoff from agriculture is a primary contributor to the frequency and severity of red tide events.
Everyday
We can't go to the beach; there's a red tide warning and the air smells terrible.
Technical
The dinoflagellate Karenia brevis is responsible for the persistent red tides in the Gulf of Mexico, producing brevetoxins that affect the nervous system.
Vocabulary
Synonyms of “red tide”
Neutral
Weak
Vocabulary
Antonyms of “red tide”
Watch out
Common Mistakes When Using “red tide”
- Using 'red tide' to refer to any algae bloom (must be harmful).
- Capitalizing it as a proper noun (it's not, unless part of a specific event name like 'the 2018 Florida Red Tide').
FAQ
Frequently Asked Questions
No. While often reddish-brown, the discoloration can range from orange and brown to green, depending on the algal species involved. The term is based on common appearances.
Yes. People can experience respiratory irritation from airborne toxins near the shore. Eating shellfish contaminated by red tide toxins can cause Neurotoxic Shellfish Poisoning (NSP).
All red tides are harmful algal blooms (HABs), but not all algae blooms are harmful or called 'red tides'. 'Red tide' specifically denotes a bloom that produces toxins or has other damaging effects.
Many scientists believe yes, due to factors like climate change (warmer waters), coastal nutrient pollution from fertilizers and sewage, and increased monitoring. However, frequency varies greatly by region.
A harmful algal bloom (HAB) in coastal waters where certain species of algae, often dinoflagellates, reproduce rapidly, creating discolored water (often reddish-brown) and producing toxins that can kill fish and marine mammals and cause illness in humans.
Red tide is usually formal, scientific, journalistic in register.
Red tide: in British English it is pronounced /ˌred ˈtaɪd/, and in American English it is pronounced /ˌrɛd ˈtaɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: RED DANGER TIDE. The water turns a reddish color, and the tide brings in a dangerous, toxic event.
Conceptual Metaphor
A TIDE OF DEATH/DESTRUCTION; AN INVASION (of toxins/algae)
Practice
Quiz
What is the primary characteristic that defines a 'red tide'?