trust company(n = noun.group) trust corporation - an organization (usually with a commercial bank) that is engaged as a trustee or fiduciary or agent in handling trust funds or estates of custodial arrangements or stock transfers or related services;
is a kind of financial institution, financial organisation, financial organization

   Any corporation formed for the purpose of acting as trustee. Such companies usually do more or less of a banking business. [Webster 1913 Suppl.]

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