Nearby & related entries: 1  petrol tank. 2  petrol-electric. 3  petrolatum. 4  petrolatum gauze. 5  petroleomics. 6  petroleum coke. 7  petroleum ether. 8  petroleum future. 9  petroleum geologist. 10  petroleum geology.
a combining form meaning âeating, devouring,â used in the formation of compound words: phagocyte. Compare -phage, -phagous, -phagy. Origin of phago-.
slag noun [U]. âº âwaste âmaterial âproduced when âremoving âunwanted âsubstances from âmetals. (Definition of slag from the Cambridge Academic Content Dictionary Â© Cambridge University Press).lag noun [U] (WASTE). âº [U] âwaste âmaterial âproduced when âcoal is âdug from the âground, or a âsubstance âproduced by âmixing âchemicals with âmetal that has been âheated until it is âliquid in âorder to âremove âunwanted âsubstances from it See also slag heap. See also. slag heap.