English Reference

Word

mutant

Phoneticsmu·tant

US/ˈmjutənt/

UK/mjˈuːtənt/

Definitions

01biology/science fiction

B2 · Science

n. a plant, animal, or person that has different physical features because of a change in their genes.

n. an organism or cell that has undergone a genetic mutation, resulting in a new trait or characteristic.

“In the movie, the hero was a mutant with the power to heal quickly.”

“The researchers identified a mutant strain of the virus that was significantly more resistant to standard antiviral treatments.”

Usage

Often used in science fiction to describe beings with superhuman powers.

Synonyms

02strange person or thing

C1

n. someone or something that looks or acts very strange, weird, or abnormal.

n. a person or object perceived as bizarre, abnormal, or socially deviant.

“He felt like a mutant standing there in his suit while everyone else wore beach clothes.”

“The local press treated the avant-garde building like a mutant, claiming its jagged steel frame ruined the historic skyline.”

Informal

Teaching tip

This sense can be offensive if used to describe a person's appearance; use with caution.

03having mutated

B2 · Science

adj. describing something that has changed or resulted from a genetic mutation.

adj. relating to, undergoing, or resulting from a genetic mutation; typically non-gradable.

“The scientists studied the mutant plants to see why they grew so tall.”

“The mutant gene was passed down through several generations before the physical effects became apparent to the observers.”

Synonyms

Antonyms

naturalwild-type

Real-World Examples

“The researchers later found evidence that some of the mutant cells could enter the brain itself.”
ScienceDaily · 14 Aug 2026

Etymology

From Latin mūtāns, present participle of mūtō. By surface analysis, muta- + -ant.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

mutantNounmutationNoun

Domain

Computing

This entry

Level
B2 · Upper Intermediate
Frequency
Frequent
Updated

Scan code

englishreference.com/q/mutant

English Reference