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Synonyms

identical twin

American  

noun

  1. one of a pair of twins who develop from a single fertilized ovum and therefore have the same genotype, are of the same sex, and usually resemble each other closely.

Etymology

Origin of identical twin

First recorded in 1885–90

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.

James Warren Whittaker was born on Feb. 10, 1929, in Seattle, 10 minutes before his identical twin brother, Louis.

From The Wall Street Journal • Apr. 15, 2026

Brendon has an identical twin brother named Kelly Donovan, who appeared as his stand-in and double in episodes of “Buffy.”

From Los Angeles Times • Mar. 21, 2026

This is where identical twin brothers, medical doctors and BBC podcast hosts Dr Chris and Dr Xand van Tulleken come in.

From BBC • Jan. 4, 2026

That’s more than eight times higher than the expenses on Vanguard’s real-estate index fund and its identical twin exchange-traded fund.

From The Wall Street Journal • Nov. 7, 2025

And then, to impress her, I rotated my arm so she could see the identical twin on the other side.

From "Anthem of a Reluctant Prophet" by Joanne Proulx

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.