hermetically

adverb

her·​met·​i·​cal·​ly (ˌ)hər-ˈme-ti-k(ə-)lē 

: in an airtight manner : so as to be completely airtight

—usually used in the phrase hermetically sealed

They have their digitally alarmed, healthfully air-conditioned, hermetically sealed knotty-pine wine cellars …

—Alan Richman

Designed for field use, the unit has a hermetically sealed touch keypad with six widely spaced keys suited for gloved operation.

—Oil & Gas Journal

… the entire manufacturing process takes place inside "clean rooms"—hermetically sealed factories where elaborate filtration systems keep the air a thousand times purer than in the best hospital operating rooms.

—Michael Rothschild

(figurative) … creating a world so self-absorbed, so hermetically sealed, that its connection to public life is severed altogether …

—Ella Taylor

(figurative) Control was always Jobs' approach to achieving excellence—Apple's beautiful, hermetically sealed ecosystem of products is the quintessence of control …

—Lev Grossman

Examples of hermetically in a Sentence

Recent Examples on the Web

The case was hermetically sealed with a metal border and lead. — Literary Hub, 13 May 2026

That room is hermetically sealed like a Chris Rock concert. — David Aldridge, New York Times, 11 May 2026

However, most commercial lithium-ion batteries are hermetically sealed in rigid packages to keep out moisture that can degrade their performance, and to prevent toxic and flammable electrolytes from leaking out. — IEEE Spectrum, 21 Apr. 2025

Unlike some of Dubai’s city centre skyscrapers, where rooms are hermetically sealed within glass and steel, every accommodation comes with its own spacious balcony for lounging and gazing at the sun setting over the sea or the city lighting up at dusk. — Condé Nast, Condé Nast Traveler, 26 Jan. 2026

Word History

First Known Use

1605, in the meaning defined above

Rhymes for hermetically

• magnetically
• pathetically
• electrophoretically
• parenthetically
• sympathetically
• theoretically