ETYM French enveloppe.
1. A flat rectangular paper container for papers.
2. A natural covering (as by a fluid).
3. Any wrapper or covering.
4. (Geometry) A curve that is tangent to each of a family of curves.
5. The bag containing the gas in a balloon; SYN. gasbag.
6. The maximum operating capability of a system.
In geometry, a curve that touches all the members of a family of lines or curves. For example, a family of three equal circles all touching each other and forming a triangular pattern (like a clover leaf) has two envelopes: a small circle that fits in the space in the middle, and a large circle that encompasses all three circles. + prikaži više

ETYM Old Eng. hul, hol, shell, husk, as. hulu; akin to German hülle covering, husk, case, hüllen to cover, Goth. huljan to cover, as. helan to hele, conceal. Related to Hele, Hell.
1. Dry outer covering of a fruit or seed or nut.
2. Persistent enlarged calyx at base of e.g. a strawberry or raspberry.
3. The frame or body of ship.
4. A large fishing port. + prikaži više

ETYM Prob. for hulsk, and from the same root as hull a husk. Related to Hull a husk.
Outer membranous covering of some fruits or seeds.