A metaphosphate ion is an oxyanion that has the empirical formula PO3−. The structure of a metaphosphate ion can be described as being made up of PO4 structural units in which each unit shares two corners with another unit. This can come about in two ways. == See also == ...
• (n.) A salt of metaphosphoric acid.
Met`a·phos'phate noun (Chemistry) A salt of metaphosphoric acid.