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ultrathin

American  
[uhl-truh-thin] / ˌʌl trəˈθɪn /

adjective

  1. extremely thin.

    an ultrathin wristwatch.


Etymology

Origin of ultrathin

First recorded in 1945–50; ultra- + thin

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.

In a new study published in Nature Materials, physicists led by researchers at The University of Texas at Austin observed a sequence of unusual magnetic states in an ultrathin material.

From Science Daily • Mar. 7, 2026

Items in short supply include the ultrathin layers of silicon substrate some chips require and memory chips, the semiconductors that feed data to AI processors and help store the results of computations.

From The Wall Street Journal • Dec. 30, 2025

This newly observed response offers a controllable way to tune the behavior and properties of these ultrathin materials.

From Science Daily • Nov. 14, 2025

So he made an Apple store appointment to buy the new, ultrathin smartphone the day it went on sale.

From The Wall Street Journal • Nov. 8, 2025

My AboundSound audio system consisted of an array of ultrathin speakers mounted on the apartment’s walls, floor, and ceiling, providing 360 degrees of perfect spatial pin-drop sound reproduction.

From "Ready Player One: A Novel" by Ernest Cline

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