orthoform
Pharmacology now rare
noun
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.
Origin
Late 19th century; earliest use found in The Lancet. From ortho- + -form, after German Orthoform; compare quot. 1897.