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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

en·ve·lope

(en'vĕ-lōp), Avoid the mispronunciation ahn'vĕ-lōp.
In anatomy, a structure that encloses or covers.
Farlex Partner Medical Dictionary © Farlex 2012

envelope

(ĕn′və-lōp′, ŏn′-)
n.
Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

en·ve·lope

(en'vĕ-lōp)
anatomy Any structure that encloses or covers.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

en·ve·lope

(en'vĕ-lōp)
In anatomy, a structure that encloses or covers.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
This is the strength of Pushing the Envelope: Ornstein is able to take pedagogical philosophy and ground it in real-life situations found in schools.
Banks were limited in the securities activities they could pursue, even if the bank regulators kept pushing the envelope. But a nationally chartered bank could conduct its securities business without registration or examination by the SEC.
When you are pushing the envelope like competition shooter Jerry Miculek, every little thing counts and since the contact between the man and the gun is in the grip, something special has to be done there.
"People should keep in mind that every time you launch a mission that's pushing the envelope of new techniques and new technology, you have the potential for failure," Watzin says.
However, according to Richard Gordon, semiconductor analyst at Dataquest, the technology advance should be seen as a reaffirmation by the companies of their intention to keep pushing the envelope of DRAM production in a hyper-competitive market.
Against Edgar Wind, the early Garin, and an older tradition within Italian historiography that had seen Ficino in a somewhat conspiratorial light, as a kind of proto-Enlightenment figure pushing the envelope of orthodoxy or even as a crypto-pagan, Allen (in this respect a faithful disciple of Kristeller) takes Ficino au pied de la lettre, seeing him as a theological reformer, someone above all interested in saving Christian theology from what Allen labels the "integral Aristotelians." Ficino wanted to renew Christianity's corrupted theological traditions by abandoning the failed medieval synthesis with Aristotelianism and returning Christian theology to its ancient Platonic roots.
He should keep pushing the envelope to see how much in, out, down, or even up that the umpire is going to give him.
The 67-year-old singer told Katie Couric that she believes there's a difference between pushing the envelope sexually and pushing the envelope creatively, the Mirror reported.
DC Zain Nadir is "pushing the envelope" in his pursuit of "international drugs cartel member" Lara from Casualty - and not just the envelope.
What's different about the nanotech megatrend is the unusual convergence of disciplines, scholars, and practitioners--all pushing the envelope and unified in purpose, mission, and vision.
"Big business always looks at the bottom line, but this goes beyond the bottom line" says Cheryl Roth, co-founder of Organic Works Marketing, a New York public relations firm that represents Bossa Nov& "They are pushing the envelope in a lot of different directions to save the rainforest.
While the conversions of many of the heavier castings have already left the gate, ferrous metalcasters have responded, pushing the envelope on what they can bring to the lightweighting table.