pumice

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pumice

 [pum´is]
a substance consisting of silicates of aluminum, potassium, and sodium; used in dentistry as an abrasive.

pum·ice

(pŭm'is),
Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive.
[L. pumex (pumic-), a pumice stone]

pumice

/pum·ice/ (pum´is) a very light, hard, rough, porous, grayish powder consisting of silicates of aluminum, potassium, and sodium; used in dentistry as an abrasive.

pumice

[pum′is]
Etymology: L, pumex
a finely divided volcanic rock used in powdered or solid form for smoothing or polishing surfaces.

pum·ice

(pŭm'is)
Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive.
[L. pumex (pumic-), a pumice stone]

pumice

a substance consisting of silicates of aluminum, potassium and sodium; used in dentistry as an abrasive.

pumice-stone lung
microlithiasis alveolaris pulmonum.