envelope - Hutchinson encyclopedia article about envelope Printer Friendly
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envelope

   Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia 0.03 sec.

envelope

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.



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? Mentioned in ? References in classic literature
 
The outer envelope might then be cast off as a useless encumbrance; and the second balloon, left free to itself, would not offer the same hold to the currents of air as a half-inflated one must needs present.
Five Weeks in a Balloon by Verne, Jules View in context
Then he took the envelope itself, held it up to the light, and very carefully studied both the exterior and the flap.
The Valley of Fear by Doyle, Sir Arthur Conan View in context
Robert returned, and waited near his mistress, with the directed envelope in his hand.
My Lady's Money by Collins, Wilkie View in context
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