What does hermetic mean?
Hermetic is an adjective describing something that is sealed airtight or designed to prevent air, gases, fluids, and other material from passing through. In engineering, manufacturing, and laboratory contexts, a hermetic container or seal creates a controlled boundary that protects what is inside from contamination and prevents leakage. The word can also suggest complete self-containment or isolation from outside influences, sometimes with the implication of secrecy. Its older historical use refers to the Hermetic traditions associated with alchemy, astrology, and occult philosophy. The term is formal and technical in its physical applications, where precision matters, but it has also acquired a figurative, slightly esoteric quality. It is useful because it names not simply a closed object but a deliberate barrier: the contents remain protected while the surrounding environment is kept out.
adjectiveHermetic means airtight or sealed so that air, gas, or other material cannot pass through. In a broader historical sense, it means associated with the Hermetic traditions of alchemy, astrology, and occult philosophy.
- Airtight or sealed so that air, gas, or other material cannot pass through.
- Isolated or self-contained from external influences.
- Relating to the Hermetic traditions of alchemy, astrology, and occult philosophy.
"The laboratory used a hermetic seal to prevent contamination of the sample."
"The container was hermetic, so no contaminants could enter the chamber."
"Her interest in Hermetic philosophy led her to study alchemical texts and astrology."
A hermetic seal turns a fragile boundary into a promise: whatever is inside stays in, and whatever is outside stays out.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of hermetic
Hermetic comes through Latin from Greek Hermetikos, meaning “of Hermes,” a term associated with writings attributed to Hermes Trismegistus. English adopted the word in connection with alchemy and occult traditions before applying it to vessels and enclosures that are airtight. Related English words such as hermeneutic and hermeneutics ultimately derive from the Greek name Hermes through its sense as an interpreter or transmitter of hidden knowledge.
Related word forms
How hermetic is actually used
In modern technical and scientific contexts, hermetic is usually formal and describes a vessel, enclosure, or system that prevents the passage of air, gases, or fluids. The older sense relating to Hermetic philosophy is specialized and historical. The word is sometimes used figuratively for people or communities that are deliberately isolated from wider society.
Easily confused with hermetic
Hermetic means sealed or airtight, while hermitic means characteristic of a hermit or a solitary, secluded life.