envelope

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envelope

 [en´vĕ-lōp]
1. an encompassing structure or membrane.
2. in virology, the outer lipoprotein coat of a large virus, surrounding the capsid and usually furnished, at least partially, by the host cell. Called also peplos.
3. in bacteriology, the cell wall and the plasma membrane considered together.
nuclear envelope the condensed double layer of lipids and proteins enclosing the cell nucleus and separating it from the cytoplasm; its two concentric membranes, inner and outer, are separated by a perinuclear space.

en·ve·lope

(en'vĕ-lōp), Avoid the mispronunciation ahn'vĕ-lōp.
In anatomy, a structure that encloses or covers.

envelope

(ĕn′və-lōp′, ŏn′-)
n.
Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.

en·ve·lope

(en'vĕ-lōp)
anatomy Any structure that encloses or covers.

envelope

any enclosing structure, such as a membrane or skin. In bacteria, it is the part of the cell enclosing the cytoplasm, i.e. the cytoplasmic membrane cell wall and capsule. In VIRUSES, it is the outer lipid-containing layer of some virions.

en·ve·lope

(en'vĕ-lōp)
In anatomy, a structure that encloses or covers.
References in classic literature ?
Giry looked into the envelope with a lackluster eye, which soon recovered its brilliancy.
But it was not the withered hand of the angry old beldame that fell on the managerial ear, but the envelope itself, the cause of all the trouble, the magic envelope that opened with the blow, scattering the bank-notes, which escaped in a fantastic whirl of giant butterflies.
"You tell me there were twenty-thousand francs in the envelope which I put into M.
Instead of that, he had intended, before his plans were nipped, to send me the clue in this envelope. He says so in his note.
There he was, sitting with a newly opened envelope in one hand and five dried orange pips in the outstretched palm of the other one.
"He looked inside the envelope. 'So it is,' he cried.
The young man took from his waistcoat a crumpled envelope, and turning to the table he shook out upon it five little dried orange pips.
"You were good enough to give me an appointment, sir," said I, humbly, producing his envelope.
He seated himself at his desk and D'Artagnan proceeded to examine his face, as he had just examined the letter he held, but the envelope which covered his countenance appeared as impenetrable as that which covered the letter.
"You are sure the grey envelope was in the left cupboard?" he asked.
"The grey envelope-- it was a white envelope really--was--"
"I'm frightened of a white envelope," said the other seriously, "If it had only just been grey!