Szczelny

Szczelny is a Polish adjective meaning tight-sealed, airtight, or watertight. It describes objects, structures, or joints designed to prevent the passage of air, gas, or liquid. Common phrases include szczelny pojemnik (airtight container), szczelne złącze (sealed joint), and drzwi szczelne (airtight doors). The term is widely used in packaging, plumbing, construction, and mechanical engineering.

Morphology and usage: szczelny agrees with gender and number, e.g., szczelny (m. sg), szczelna (f. sg), szczelne (n. sg or pl). The noun form szczelność denotes tightness or impermeability; the adverb szczelnie means tightly or sealingly. The related adjective nieszczelny denotes the opposite, leaky or not sealed.

Etymology: szczelny is a native Polish word built on the root szczel-, with historical usage in materials science, engineering, and everyday language. It is part of a broader Slavic lexicon describing sealing, closures, and impermeability, and has cognates in other West and South Slavic languages that convey a similar meaning of being tightly closed.

See also: nieszczelny, szczelność. In Polish, the term may also appear in technical specifications, construction contracts, packaging standards, and quality control documents to specify the required level of impermeability or sealing performance.