Early 19th century; earliest use found in John Richardson (1797–1852), author. From post-classical Latin heuristicusheuristic + -al, originally after German heuristisch.
Definition of heuristical in US English:
heuristical
adjectivehjʊəˈrɪstɪkl
Heuristic.
Origin
Early 19th century; earliest use found in John Richardson (1797–1852), author. From post-classical Latin heuristicus heuristic + -al, originally after German heuristisch.