bas·​i·​lisk | \ ˈba-sə-ˌlisk How to pronounce basilisk (audio) , ˈba-zə- \

Definition of basilisk

 (Entry 1 of 2)

1 : a legendary reptile with fatal breath and glance
2 : any of several crested tropical American lizards (genus Basiliscus of the family Iguanidae) related to the iguanas and noted for their ability to run on their hind legs



Definition of basilisk (Entry 2 of 2)

: suggesting a basilisk : baleful, spellbinding the eyes … with all their blaze of basilisk horror— Bram Stoker

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Did You Know?


In Hellenic and Roman legend, a basilisk (also called a cockatrice) was a serpent-like creature capable of destroying other creatures by way of its deadly stare. The modern basilisk is a lizard that belongs to the family Iguanidae and supposedly resembles this fabled monster; it has a large, inflatable crest atop its head and is sometimes called a "Jesus Christ lizard" for its ability to run quickly across the surface of water. The use of "basilisk" as an adjective occurs most frequently in phrases such as "basilisk stare"; recalling the notorious gaze of the legendary basilisk, it describes the deep and piercing look of someone who is frightening or seductive.

Examples of basilisk in a Sentence

Recent Examples on the Web: Noun The catoblepas and, more famously, the basilisk, both described by Pliny the Elder, could kill with the single glance. Robert Martone, Scientific American, "When Our Gaze Is a Physical Force," 29 Dec. 2020 Small, lightweight water striders, for instance, rely entirely on surface tension to stay afloat, while the larger, heavier basilisk lizards employ a slapping motion with their feet that creates pockets of air bubbles to keep from sinking. Jennifer Ouellette, Ars Technica, "Gecko’s soft hairy toes reorient to help it stick to different types of surfaces," 11 May 2020 Connelly and her fellow stain-hunters were not interested in basilisks one day last November. Tom Avril,, "Scans reveal secrets of medieval 'Harry Potter' book and medical texts at Penn," 14 May 2018 In the original books, Harry's missions were always 100% necessary (ex: Saving the Sorcerer's Stone from Voldemort, saving Ginny Weasley from the basilisk, saving Sirius from Voldemort, hunting down Horcruxes). Kelsey Stiegman, Seventeen, "After Reading The "Harry Potter" Series 20 Times, Here's Why I'll Never Touch "Cursed Child" Again," 25 Oct. 2016 In some stories, the crowing of a rooster is fatal to the mythological snake known as a basilisk. National Geographic, "See How This Rooster Fought Off a Cobra," 30 Aug. 2017 What’s more, early legends of the basilisk may have been inspired by cobras. National Geographic, "8 Real-Life ‘Fantastic Beasts’ and Where to Find Them," 18 Nov. 2016

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

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First Known Use of basilisk


13th century, in the meaning defined at sense 1


15th century, in the meaning defined above

History and Etymology for basilisk


Middle English, borrowed from Latin basiliscus "kind of snake," borrowed from Greek basilískos "minor prince, kind of snake (presumably possessing a crown-like crest)," from basil-, base of basileús "king, prince" (of pre-Greek substratal origin) + -iskos, diminutive suffix

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Time Traveler for basilisk

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The first known use of basilisk was in the 13th century

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Last Updated

9 Jan 2021

Cite this Entry

“Basilisk.” Dictionary, Merriam-Webster, Accessed 22 Jan. 2021.

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More Definitions for basilisk


How to pronounce basilisk (audio)

English Language Learners Definition of basilisk

in stories and legends : a reptile that can kill people by breathing on them or looking at them

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