Definition of orthoform in English:

orthoform

noun

Pharmacology
rare
  • 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.