insurerin·sur·er /ɪnˈʃʊərə-ˈʃʊrər/ noun [countableC]INSURANCE1an insurance companyIf an insurer failed, the industry organization would pay 90% of all claims.
2the insurer/insurers used in a particular insurance contract or legal case to refer to the company providing insurance. You can refer to ‘the insurers’ even if there is only one companyWhen he tried to recover his loss, the insurers denied liability.