Definition

1. Noun:

   • A very light, porous, and abrasive volcanic rock formed from frothy lava. It is typically pale in color and floats on water.
   • A piece of this rock, often used as an abrasive for smoothing or cleaning surfaces.

2. Verb:

   • To rub, smooth, or clean a surface with pumice.

Examples

• Noun:
  • The beach was covered in gray pumice from the recent volcanic eruption.
  • She used a piece of pumice to remove the rough skin from her feet.
• Verb:
  • The artisan pumiced the wooden surface to prepare it for finishing.
  • You can pumice stubborn stains off the ceramic tile.

Advanced Usage

• Geological Context: In geology, 'pumice' refers specifically to the frothy, glassy rock texture formed by rapid cooling and depressurization of gas-rich lava.
  • The volcanic deposit consisted primarily of ash and pumice.
• Cosmetic/Personal Care Context: Refers to the use of pumice stones for exfoliation.
  • Regular use of a pumice stone can help keep calluses soft.

Variants and Related Words

• Pumice stone: (noun) Another common term for a piece of pumice, especially when used as a tool.
  • He bought a new pumice stone for the shower.
• Pumiceous: (adjective) Of or resembling pumice.
  • The pumiceous texture of the rock made it very light.

Synonyms

• Noun: Lava rock, volcanic glass, abrasive stone, scoria (note: scoria is typically denser and darker).
• Verb: Scour, abrade, sand, smooth, polish.

Related Phrases

• Pumice float test: A simple test to identify pumice based on its ability to float in water.
  • We performed a pumice float test on the collected samples.
• Pumice concrete: A lightweight concrete made using pumice as an aggregate.
  • Pumice concrete is often used in construction for its insulating properties.

Noun

1. a light glass formed on the surface of some lavas; used as an abrasive

Verb

1. rub with pumice, in order to clean or to smoothen