One of the mysteries of the English language finally explained.
Either of two isomeric compounds used as local anaesthetics and having the formula C₈H₉NO₃, respectively the methyl esters of 3-amino-4-hydroxybenzoic acid and (originally) 4-amino-3-hydroxybenzoic acid.
Late 19th century; earliest use found in The Lancet. From ortho- + -form, after German Orthoform; compare quot. 1897.
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