Meta- (chemistry)

• In organic chemistry, meta indicates the positions of substituents in aromatic cyclic compounds. The substituents have the 1,3-positions, for example in resorcinol.
• Meta may also denote the dehydrated form of an acid, salt or organic derivative in a series. For example:
• *metabisulfite: 2 bisulfite → 1 metabisulfite +
• *metaphosphoric acid: 3 orthophosphoric acid → 1 trimetaphosphoric acid + 3.
• *Meta-antimonic acid, the dehydrated form of antimonic acid, is.