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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.

The ultrathin sensor can capture light across the entire electromagnetic spectrum.

From Science Daily • Mar. 4, 2026

The cables themselves often contain dozens or hundreds of flexible, ultrathin glass fibers to carry signals.

From The Wall Street Journal • Feb. 7, 2026

Elsewhere in the plant, workers cut the ingots into ultrathin wafers using diamond wire saws.

From Barron's • Nov. 7, 2025

Apple had intended the ad to send the opposite message, that its ultrathin iPad Pro could power an array of creative activities that previously required individual tools.

From New York Times • May 9, 2024

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