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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]