Dictionary.com
Thesaurus.com

rattlesnake

American  
[rat-l-sneyk] / ˈræt lˌsneɪk /

noun

rattlesnakes plural
  1. any of several New World pit vipers of the genera Crotalus and Sistrurus, having a rattle composed of a series of horny, interlocking elements at the end of the tail.


rattlesnake British  
/ ˈrætəlˌsneɪk /

noun

  1. any of the venomous New World snakes constituting the genera Crotalus and Sistrurus , such as C. horridus ( black or timber rattlesnake ): family Crotalidae (pit vipers). They have a series of loose horny segments on the tail that are vibrated to produce a buzzing or whirring sound

"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

Other Word Forms

Noun Inflected Forms

Etymology

Origin of rattlesnake

An Americanism dating back to 1620–30; rattle 1 + snake

Compare meaning

How does rattlesnake compare to similar and commonly confused words? Explore the most common comparisons:

Explanation

A rattlesnake is a long, venomous reptile with a tail that shakes, making a sound like a maraca, before it bites. When you're camping in the Arizona desert, you'll want to keep an eye out for rattlesnakes. Rattlesnakes get their name from the rattle at the end of their tails that's composed of rattling pieces of keratin, the same kind of protein found in your fingernails. In order to scare off predators, rattlesnakes noisily vibrate their tails, warning that they're ready to strike. While these snakes cause most snake bites in the U.S., they only attack if they're feeling threatened, and rattlesnake bites aren't deadly if they're treated right away.

Keep Reading on Vocabulary.com

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Hayes emphasized that a bite from any rattlesnake remains a medical emergency and requires immediate medical attention.

From Science Daily Jul. 10, 2026

Christopher Gadsden’s coiled rattlesnake “Don’t Tread On Me” flag from 1775 symbolized that fight for freedom: Don’t tell me what to do.

From The Wall Street Journal Jun. 28, 2026

The midtempo “Ridin’ High” starts with a descending harp glissando that pours into a synthesizer seasoned by a vibraslap’s rattlesnake hiss.

From The Wall Street Journal May 25, 2026

In 2025, the county reported a total of nine rattlesnake bites.

From Los Angeles Times May 1, 2026

He was four, maybe five years old, and he had never seen a rattlesnake.

From "The Milagro Beanfield War" by John Nichols

After reviewing the history and spread of the myth, researchers concluded that bites from adult rattlesnakes are generally more dangerous because adults carry and inject much larger amounts of venom.

From Science Daily Jul. 10, 2026

A common belief that baby rattlesnakes are more dangerous than adults has been overturned by a new study from Loma Linda University.

From Science Daily Jul. 10, 2026

Fourteen of the 34 rattlesnakes carried the parasite.

From Science Daily May 26, 2026

The best way to avoid rattlesnakes is to stay on a designated trail and be aware of where you’re stepping.

From Los Angeles Times Apr. 21, 2026

Here's a good rule to remember about rattlesnakes and scorpions: If you don't bother them, they won't bother you.

From "Holes" by Louis Sachar

Vocabulary.com logo
by dictionary.com

Join 12,000,000 vocabulary learners

Start learning new words today on VocabTrainer.
You'll remember them forever.

Start training