envelope in Polish
envelope in Polish
koperta
A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
otoczka
Something that envelops; a wrapping.
powłoka
Something that envelops; a wrapping.
obwiednia
(geometry) A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.