Master English one word at a time. World of Words provides a daily English word with its precise meaning, pronunciation, and practical usage examples to help you build a powerful vocabulary.
Hermetic means "airtight or protected," referring to everything from a sealed lid to an organization that's closed off from outside influence. The term comes from Hermes Trismegistus, a mythical alchemist. You can appreciate hermetic properties when a tight jar finally gives you that satisfying "pop!"
