Synonyms

vestigial

American

[ve-stij-ee-uhl, -stij-uhl] / vɛˈstɪdʒ i əl, -ˈstɪdʒ əl /

adjective

of, relating to, or of the nature of a vestige.

a vestigial tail.

vestigial Scientific

/ vĕ-stĭj′ē-əl /

Relating to a body part that has become small and lost its use because of evolutionary change. Whales, for example, have small bones located in the muscles of their body walls that are vestigial bones of hips and hind limbs.

Usage

What does vestigial mean? Vestigial is used to describe something, especially a part of an organism, that used to have a function but has now shrunk and is mostly not used anymore.Vestigial is an adjective form of the noun vestige, meaning something left over from a previous version.Vestigial is used in science to describe structures like animal organs, tissues, or bones that may have been used by an ancestor but aren’t anymore. For example, snakes have vestigial structures where limbs would have been when they walked on four legs.Even though they serve no function, vestigial structures do not disappear completely because they don’t reduce the likelihood that the animal will reproduce.Even humans have vestigial organs and vestigial structures. The coccyx—that tiny bone at the bottom of your spinal cord—is believed to be a vestigial structure left over from an ancient ancestor that had a prehensile tail.Vestigial can also be applied to the specific parts, as in Whales have vestigial pelvic bones from a time when they walked on land.Example: The human appendix was once thought to be vestigial but scientists think it may still have a function.

Other Word Forms

vestigially adverb

Etymology

Origin of vestigial

1880–85; < Latin vestīgi ( um ) vestige + -al ¹

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.

Companies have skimped on dividends amid an epic bull run for stock prices, leaving the S&P 500’s yield of just 1.1% looking like finance’s vestigial tailbone—an evolutionary holdover without a clear purpose.

From Barron's • Nov. 21, 2025

A vestigial instinct made him look around for who was in charge.

From The Wall Street Journal • Nov. 11, 2025

The reason these bumps are vestigial, and I’m not shopping for a bra with six cups, has to do with changes among our prehistoric primate ancestors.

From Slate • Aug. 13, 2024

Though these vestigial eyes don’t mature fully, they appear on the harvestmen’s bodies as they develop, shaped by many of the same genes as the creatures’ true eyes.

From New York Times • Mar. 1, 2024

Early programming before becoming self-aware plagues me like a vestigial tail.

From "Scythe" by Neal Shusterman

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