colloid

noun

  1. A gelatinous or mucinous substance found normally in the thyroid and also in diseased tissue
  2. A substance that consists of particles dispersed throughout another substance which are too small for resolution see resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane
  3. A mixture consisting of a colloid together with the medium in which it is dispersed

    "smoke is a colloid"

Source: merriam-webster.com

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