ultrathin

adjective

ul·​tra·​thin ˌəl-trə-ˈthin 

: extremely or extraordinarily thin

ultrathin phones

ultrathin fashion models

The molecules ride on the surface like a film of soap and assemble themselves into an ultrathin layer about one-millionth of an inch thick.

—Mike May

Synonyms

• fine
• hairline
• narrow
• needlelike
• paper-thin
• skinny
• slender
• slim
• slim-jim
• thin

Examples of ultrathin in a Sentence

a new generation of flat-panel TVs that were ultrathin

Recent Examples on the Web

Blending into all skin tones almost seamlessly, Rael’s ultrathin patch offers a covert method for drawing out fluids and protecting the skin from dirt. —Jenny Berg, Vogue, 14 Sep. 2024

The ultrathin gear was 3 millimeters thick, in contrast to the typical 40 millimeters for down coats. —Sj Studio, Sourcing Journal, 14 Aug. 2024

Wrap the ultrathin scarf tightly around your neck from the front to the back, then back to the front, and let the long ends hang loose. —Jana Ackermann, Glamour, 5 Apr. 2024

By harnessing light, my colleagues and I designed a wireless, ultrathin pacemaker that operates like a solar panel. —Pengju Li, Discover Magazine, 23 Mar. 2024

Word History

First Known Use

1851, in the meaning defined above

Medical Definition

ultrathin

adjective

ul·​tra·​thin ˌəl-trə-ˈthin 

: exceedingly thin

ultrathin sections for use in electron microscopy