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envelope
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   Also found in: Dictionary/thesaurus, Medical, Financial, Encyclopedia 0.01 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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Over the last 40 years as composer, poet, lyricist, musician, vocalist and sound pioneer, Lou Reed has constantly pushed the envelope with his art -- and through his lack of compromise transformed many seemingly impossible barriers.
 
 
 
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