(metrology) An SI unit of time equal to 10⁻¹² seconds. Symbol: ps

(biochemistry) The removal of intermediate metabolites, especially in the citric acid cycle, to prevent their accumulation in the mitochondrial matrix.

(organic chemistry) A halogenated hydrocarbon, CHBrClF, that is used in some fire extinguishers; its chirality is the basis of the Cahn-Ingold-Prelog rules

(Australian rules football) The onfield play of a ruck.