coinsurerglossary / COINSURER coinsurer. An insurer who shares losses sustained under an insurance policy. See coinsurance under INSURANCE. [Cases: Insurance 2285. C.J.S. Insurance §§ 1137–1143.] 词条贡献者 资深译员Lorna,毕业于一所培养高级翻译以及跨文化事务专家的精英大学,专注翻译各种与房地产投资信托有关的法律文件。