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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

People who disagree with him include his identical twin brother.

From The Wall Street Journal • Mar. 31, 2026

The fans wanted more this year - perhaps it is time for Yates' less decorated, identical twin brother Adam to provide it.

From BBC • Jan. 7, 2026

Se Youn “Steve” Kim, 41, and his identical twin brother, Hee Youn “Ted” Kim, 41, were arrested Thursday morning by federal authorities and pleaded not guilty.

From Los Angeles Times • Sep. 12, 2025

My gaze passed over Neil’s identical twin brother, Sahil Roy, who apparently had noticed me and was now smiling, his face bright and happy.

From "From Twinkle, with Love" by Sandhya Menon

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.