-ical etymology

English word -ical comes from Old French -ique (Used to form adjectives; -ic.)

Detailed word origin of -ical

Dictionary entryLanguageDefinition
-ique Old French (fro) Used to form adjectives; -ic.
-ical English (eng) Used to form adjectives from nouns with the meaning "of or pertaining to"; adjectival suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.