1. a mineral, aluminum oxyhydroxide, AlO(OH), occurring in crystals, or more usually in lamellar or scaly masses: a principal constituent of bauxite and an important source of aluminum.
  2. Botany. a disseminule, especially one that undergoes dispersal.


  1. a white, yellowish, or grey mineral consisting of hydrated aluminium oxide in orthorhombic crystalline form, found in bauxite and corundum. Formula: AlO(OH)
  2. any propagative part of a plant, esp one that is easily dispersed, such as a spore

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