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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]

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.

but·ton

(bŭt'ŏn)
A structure, lesion, or deviceof knob shape.
[M.E., fr. O.Fr. bouton, fr.bouter, to thrust, fr. Germanic]

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.

but·ton

(bŭt'ŏn)
A structure, lesion, or device of knob shape.
[M.E., fr. O.Fr. bouton, fr. bouter, to thrust, fr. Germanic]
References in periodicals archive ?
If it's that easy, don't sit at home and press buttons on your phone'."
"He told them that they will receive an electric shock if they press buttons next to other symbols on EVMs except that of Congress."
What, you mean I can sit at home and press buttons which make real-life fighters battle it out?
Voice Assist is an award-winning provider of mobile speech solutions designed to be used from any phone and eliminates the need to press buttons on smartphones, tablet PCs or other network-connected devices.
The user interface was optimised for productive safe driving with the ability to issue command after command without the need to hold the phone or press buttons repeatedly.
'Guitar Hero' requires players to press buttons on a guitar-shaped device in time to music, with varying degrees of difficulty.