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Very small, finely divided solids (particles that do not dissolve) that remain dispersed in a liquid for a long time due to their small size (usually less than 1 mm) and electrical charge. These particles have negligible settling velocity because their small mass have a low gravitational force compared to surface frictional forces.
This entry is located in the following units: colloido-, colloid- + (page 1) -oid, -oidal, -oidism, -odic (page 6)
Word Entries at Get Words: “colloids
Extremely small mineral particles which can remain in suspension in water indefinitely.

The particles can be large molecules like proteins, or solid, liquid, or gaseous aggregates and the suspension is of finely divided particles in a continuous medium from which the particles do not settle out rapidly and are not readily filtered.

This entry is located in the following unit: Geography Terms + (page 3)