# Pyro- Prefix in Chemistry [duplicate]

I was wondering is someone could please help answer this question for me. I was recently reading the ingredients on my toothpaste container, and one of the compounds in it was 'Sodium Pyrophosphate'; what does the 'Pyro-' prefix mean? I see it elsewhere but I've never come across such a nomenclature such as this. What does it mean in terms of Chemistry?

If you have any questions about the definitions of chemical nomenclature, have a look at the IUPAC gold book. See here. It basically says, that a pyro compound is one that is formed by heating another compound, usually under the loss of simple molecules like $\mathrm{H_2O}$ or $\mathrm{CO_2}$.