What does the word filtration mean?

Usage examples for filtration

  1. The whole formation of the district, these capacious caverns, and the numerous and extensive tea- tree swamps along the coast, plainly demonstrate that they are supplied by gradual filtration, or find their way through the interstices, or cells of the lava to the lower levels. – Expedition into Central Australia by Charles Sturt
  2. Worcester is also proposing to chlorinate the supply to maintain the purity of the water without extending the slow sand filtration plant. – Chlorination of Water by Joseph Race
  3. He had a matter of six or seven cubic centimeters of clear liquid as the conclusion of a long process of culturing, and examination by microscope, and again culturing plus final filtration. – This World Is Taboo by Murray Leinster