| Subject | English | French |
| chem. | aceto-ortho-toluidine | acéto-o-toluidine |
| chem. | aceto-ortho-toluidine | acétyl-o-toluidine |
| chem. | acetyl-ortho-toluidine | acéto-o-toluidine |
| chem. | acetyl-ortho-toluidine | acétyl-o-toluidine |
| chem. | ferrous ortho-phenanthroline | ortho-phénanthroline ferreuse |
| chem. | isopropyl-ortho-cresol | isopropyl-ortho-crésol |
| chem. | isopropyl-ortho-cresol | carvacrol |
| chem. | monosodium ortho-phosphate | phosphate monosodique (phosphate diacide de sodium) |
| chem. | non-ortho chlorine substituted PCB | PCB non-ortho substitué |
| chem. | non-ortho chlorine substituted PCB | PCB non substitué en position ortho |
| chem. | non-ortho substituted congener | congénère non-ortho substitué |
| med. | ortho-acetoxybenzoic acid | acide acétylsalicylique |
| med. | ortho-acusia | orthacousie |
| chem. | ortho-aminophenol | ortho-aminophénol |
| chem. | ortho-aminotoluene | ortho-amino-toluène |
| chem. | ortho-aminotoluene | o-toluidine |
| chem. | ortho-anisidin | anisidine (ortho) |
| chem. | ortho-arsenic acid | acide arsénique |
| chem. | ortho-benzoic sulfimide | imide orthosulfobenzoïque |
| chem. | ortho-benzoic sulfimide | saccharine |
| chem. | ortho-chlorobenzylidenemalononitrile | chlorobenzylidène malononitrile |
| chem. | ortho-chlorophenol | ortho-chlorophénol |
| IT | ortho-code | code orthogonal |
| chem. | ortho-cresol | ortho-méthylphénol |
| chem. | ortho-cresol | ortho-crésol |
| chem. | ortho diaminophenol | ortho diaminophenol |
| tech., chem. | ortho-dichlorobenzene | o-dichlorobenzène |
| chem. | ortho-dichlorobenzene | 2-Dichlorobenzène |
| chem. | ortho-dichlorobenzene | o-Dichlorobenzène |
| tech., chem. | ortho-dichlorobenzene | ortho-dichlorobenzène |
| chem. | ortho-dihydroxybenzene | pyrocatéchine 1-2 |
| chem. | ortho-diphenyleneethylene | phénanthrène |
| chem. | ortho-directing | orienter en position ortho |
| chem. | ortho-directing | orienter en ortho |
| chem. | ortho-directive | orienter en ortho |
| chem. | ortho-directive | orienter en position ortho |
| chem. | ortho-hydroxybenzoic acid | acide ortho-hydroxy-benzoïque |
| chem. | ortho-hydroxybenzoic acid | acide orthoxybenzoïque |
| chem. | ortho-hydroxybenzoic acid | acide ortho-hydroxybenzoïque |
| chem. | ortho-hydroxybenzoic acid | acide salicylique |
| med. | ortho-involution | involution normale |
| nucl.phys., med. | ortho-iodohippurate | n-o-iodobenzoylaminoacétate de sodium |
| nucl.phys., med. | ortho-iodohippurate | ortho-iodohippurate de sodium |
| nucl.phys., med. | ortho-iodohippurate | iodohippurate de sodium |
| nucl.phys., med. | ortho-iodohippurate | hippuran |
| nucl.phys., med. | ortho-iodohippuric acid | iodohippurate de sodium (a radiopharmaceutical) |
| nucl.phys., med. | ortho-iodohippuric acid | n-o-iodobenzoylaminoacétate de sodium (a radiopharmaceutical) |
| nucl.phys., med. | ortho-iodohippuric acid | ortho-iodohippurate de sodium (a radiopharmaceutical) |
| nucl.phys., med. | ortho-iodohippuric acid | hippuran (a radiopharmaceutical) |
| chem. | ortho-isomer | isomère ortho |
| chem. | ortho-methylphenol | ortho-méthylphénol |
| chem. | ortho-methylphenol | ortho-crésol |
| chem. | ortho-nitroanisole | ortho-nitroanisole |
| chem. | ortho-nitrophenyl-ß-D-galactopyranoside | ortho-nitrophényl-ß-D-galactopyranoside |
| chem. | ortho-oxybenzaldehyde | aldéhyde ortho-hydroxybenzoïque |
| chem. | ortho-oxybenzaldehyde | aldéhyde salicylique |
| chem. | ortho-oxybenzaldehyde | aldéhyde orthooxybenzoïque |
| earth.sc., el. | ortho-para conversion | transformation ortho-para |
| agric., chem. | Ortho-Phaltan | folpet |
| chem. | ortho-phenetidine | 2-aminophényléther aniline |
| chem. | ortho-phenetidine | o-phénétidine |
| chem. | ortho-phenylenediamine | di-amino-benzène |
| chem. | ortho-phenylenediamine | o-phénylène-diamine |
| pest.contr. | ortho-phenylphenol | ortho-phénylphénol |
| nat.res. | ortho-phosphate | orthophospate |
| chem. | ortho-phosphoric acid | acide orthophosphorique |
| chem. | ortho-phthalic acid | acide paraphtalique |
| chem. | ortho-phthalic acid | ortho-acide phtalique |
| chem. | ortho-phthalic acid | acide phtalique (ortho) |
| chem. | ortho-phthalic acid | acide téréphtalique |
| chem. | ortho position | position ortho: meta: para |
| chem. | ortho position | position ortho |
| med.appl. | ortho-prosthesis | ortho-prothèse |
| med.appl. | ortho-prosthesis without articulation | ortho-prothèse sans articulation |
| med.appl. | ortho-prosthesis without hinge | ortho-prothèse sans articulation |
| life.sc. | ortho-rocks | ortoroches |
| chem. | ortho-specific compounds | ortho- |
| chem. | ortho-substituent | substituant ortho |
| chem. | ortho-sulphimide benzoic acid | saccharine |
| chem. | ortho-sulphimide benzoic acid | anhydride ortho-sulfamide benzoïque |
| chem. | ortho-terphenyl | ortho-terphényl |
| chem. | ortho-tolidine | tolidine |
| chem. | ortho-tungstic acid | acide tungstique |
| chem. | sodium ortho-phenylphenate | orthophénylphénate de sodium |
| chem. | sodium ortho-vanadate | o-vanadate de sodium |
| chem. | zinc ortho-phosphate | phosphate de zinc |