from The Century Dictionary.
- noun In chem., the ‘position’ indicated by the prefix ortho-. See
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In such substances (_e. g._, salicylic acid) where the hydroxyl occupies the ortho-position to the carboxyl, complete carbomethoxylation does not take place, whereas the _m_ - or _p_ - positions offer no hindrance.
If the hydroxyls occupy the ortho-position to methyl, they may form xanthenes by splitting off water --