noun, noun which may take the genitive case particle 'no'
pertaining to objects; object-related
Used in compound terms like 対物レンズ (objective lens) or in legal/insurance contexts such as 対物賠償 (property damage compensation). Not a standalone conversational word.
対物賠償保険に加入する。
I take out property damage liability insurance.
顕微鏡の対物レンズを交換する。
I change the microscope's objective lens.