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(english) The only commercial ore of aluminum, corresponding essentially to the formula Al2O3xH2O.
(english) An external force which acts over a region of length, surface, or area: essentially any external force which is not a concentrated force.
(Concrete Engineering) The product obtained by pulverizing clinker consisting essentially of hydraulic calcium aluminates resulting from fusing or sintering a suitable proportioned mixture of aluminous and calcareous materials.
(Concrete Engineering) The product obtained by pulverizing clinker consisting essentially of hydraulic calcium silicates.