coinsurer

[koh-in-shoo r-er, -shur-]
noun
  1. a person or firm that contracts as an insurer jointly with another or others.
  2. an insured who is liable to bear part of the loss under a coinsurance provision.

Origin of coinsurer

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018