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.
Webster's New World College Dictionary, 5th Edition
Combination of -ic from French-ique, from Latin-icus, related to Ancient Greek suffix -ικός (-ikos), plus -al from Latin adjective suffix -alis, or French-el.
Ical Sentence Examples
In their phy s ical properties, the olefines resemble the normal paraffins, the lower members of the series being inflammable gases, the members from C5 to C14 liquids insoluble in water, and from C16 upwards of solids.
This new noumenal idealism began, like the preceding, by combining psycho l0 ical idealism with the transcendentalism of Kant and Fichte.
The numerous biograp ical notices are probably taken from the work of Hesychius of M letus.