met(a)- word element [Gr.], (1) a prefix indicating (a) change; transformation; exchange; (b) after; next; (2) symbol , a prefix indicating a 1,3-substituted position in derivatives of benzene; (3) a prefix indicating a polymeric acid anhydride. 
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Two examples of disubstituted benzene derivatives with substituents in the meta- position. (A), 1,3-dibromobenzene; (B), meta- xylene (1,3-dimethylbenzene).
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