insurer(n = noun.group) insurance company, insurance firm, insurance underwriter, underwriter - a financial institution that sells insurance;
is a kind of nondepository financial institution
Derived form verb insure3
One who, or that which, insures; the person or company that contracts to indemnify losses for a premium; an underwriter.
insurer, n.
1 a person or company offering insurance policies for premiums; an underwriter.
2 a person who takes out insurance.