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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 ?
The Wisconsin Department of Transportation seeks to establish a contract for the procurement of Accessible Pedestrian Signals (APS) as well as standard push buttons for use throughout the state.
This project consists of install only of new City supplied traffic signal poles, mast arms and luminaire arms that shall include the reset of existing luminaire fixtures, signal heads, pedestrian heads, internally illuminated street name signs, banded signs, pedestrian push buttons, Opticom receivers, video detection cameras, radar detectors, radio antennas and associated wiring and equipment.