outermost

American  

[ou-ter-mohst, -muhst] / ˈaʊ tərˌmoʊst, -məst /

adjective

1. farthest out; remotest from the interior or center.

   the outermost limits.

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outermost British  

/ ˈaʊtəˌməʊst /

adjective

1. furthest from the centre or middle; outmost

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Etymology

Origin of outermost

Middle English word dating back to 1350–1400; see origin at outer, -most

Example Sentences

The astronauts will then have the chance to study the solar corona, the outermost layer of the Sun's atmosphere, which will become visible as a sort of glowing halo.

From Barron's • Apr. 5, 2026

Past conflicts—due largely to a considerable lag between U.S. doctrine and technology—began with the outermost defensive ring and painfully worked toward the innermost ring of the capital, he wrote.

From The Wall Street Journal • Mar. 30, 2026

That’s when the star goes supernova, which we can detect as soon as the bounced off material breaks through the star's outermost layer — we call this the shock breakout.

From Space Scoop • Nov. 28, 2025

This region is essential for communication between brain networks but is also vulnerable to reduced blood flow from distal arteries, which carry blood from the heart to the outermost parts of the body.

From Science Daily • Oct. 14, 2025

We round Callisto and pass the orbit of Jupiter 13, the outermost of the planet’s known moons.

From "Cosmos" by Carl Sagan