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 (pum´is),

n a type of volcanic glass used as an abrasive. It is prepared in various grits and is used for finishing and polishing in dentistry. It is also used in the polishing of natural teeth during a coronal polish but is being replaced by less abrasive synthetic particles in some polishing pastes. See also polishing, coronal.

pumice

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

pumice-stone lung
microlithiasis alveolaris pulmonum.
References in periodicals archive ?
5/4) at top, clay; < 5% sub-rounded coarse fragments up to 70 mm; very sticky, very plastic, very firm; strongly developed 10-100 mm blocky breaking to crumb structure; thin waxy chocolate coloured argillans on larger aggregates and in voids and root channels; > 2%, 1-5 mm tubular pores; few 1-10 mm vertical and horizontal, fine and coarse roots; gradational, smooth boundary with large lenses and vertical channels up to 15 cm across of younger pumiceous tephra from above extending down into this horizon; rare sub-rounded stones up to 70 cm.
The Awaiti sandy loam is developed from thin Tarawera tephra on fine pumiceous alluvium, chiefly derived from Kaharoa Ash and is moderately well drained.
2002: Pumiceous rhyolitic peperite in ancient submarine volcanic successions.