ultrathin

American  

[uhl-truh-thin] / ˌʌl trəˈθɪn /

adjective

1. extremely thin.

   an ultrathin wristwatch.

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Etymology

Origin of ultrathin

First recorded in 1945–50; ultra- + thin

Example Sentences

These emitters are made from stacked ultrathin metal layers.

From Science Daily • Mar. 17, 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

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