What is Organic Law?

Legal Definition
An organic law is a law, or system of laws, that form the foundation of a government, corporation or any other organization's body of rules. A constitution is a particular form of organic law for a sovereign state.
-- Wikipedia
Legal Definition
The fundamental law or constitution, of a state or nation, written or unwritten; that law or system of laws or principles which defines and establishes the organization of its government St. Louis v. Dorr, 145 Mo. 466, 46 S. W. 976, 42 In R. A. 686, 68 Am. St Rep. 575.
-- Black's Law Dictionary
Legal Definition
Constitutional law. See 145 Mo. 466, 68 Am. St. Rep. 575, 42 L R. A. 686, 41 S. W. 1094, 46 S. W. 976.
-- Ballentine's Law Dictionary