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but·ton

(bŭt'ŏn),
A knob-shaped structure, lesion, or device.
[M.E., fr. O.Fr. bouton, fr. bouter, to thrust, fr. Germanic]
Farlex Partner Medical Dictionary © Farlex 2012

button

Drug slang
A regional term for mescaline.

Radiation safety
A hockey puck-like mass of plutonium nitrate which is a starting material for bomb-grade plutonium.
 
Transfusion medicine
An aggregate of red blood cells (RBCs) adherent to the bottom of a test tube after centrifugation; if with gentle shaking of the test tube the cells remain adherent, agglutination is assumed to have occurred, implying presence of both an antigen (on the RBCs) and a specific antibody (immunoglobulins) in the serum button.
 
Vox populi
See Panic button.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

but·ton

(bŭt'ŏn)
A structure, lesion, or deviceof knob shape.
[M.E., fr. O.Fr. bouton, fr.bouter, to thrust, fr. Germanic]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

button 

The preformed piece of glass which will become the segment of a fused bifocal or multifocal lens. It is ground and polished on one side to the appropriate curvature for fusing to the main lens (British Standard). See bifocal lens.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

but·ton

(bŭt'ŏn)
A structure, lesion, or device of knob shape.
[M.E., fr. O.Fr. bouton, fr. bouter, to thrust, fr. Germanic]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Create a nipped-in silhouette by belting a buttonless knit over a midi skirt, and adding suede boots for a mix of textures.
There have been numerous rumors circulating that HTC is working on a buttonless smartphone codenamed Ocean or Ocean Note that will have contextual UI controls.
Just check out the dodgy filler version of Independent Woman that the band perform while Shaggy goes off to find another buttonless shirt, and add to that the fact that the show loses its way somewhat once all the big songs have been played, culminating in his own, self-penned All You Need Is Love...
And while this catwalk conception was undeniably kooky, it gave us hordes of chic pieces too: buttonless camel coats, floral slips, maroon midi dresses and lots of cool oversized sweaters.
Switching to a buttonless system could reduce the likelihood of needing to make such repairs in the first place.
The trackpad has two buttons instead of the trendy buttonless pad seen almost everywhere else.
Buttonless and with a big shawl collar, this mid-length jacket eschews the need for a belt or scarf and is easy to throw on over jeans and a jumper on winter mornings, when it's too cold to contemplate lots of wardrobe options.