Of or pertaining to. Adjectival suffix appended to various words, often nouns, to produce an adjective form. Often added to words of Latin origin, but used with other words also. · Forming nouns, especially of verbal action.
词源说明
From Ancient Greek ἄκρονυξ (ákronux, “nightfall”) + -al, one of the three poetic times for the rising and setting of stars, along with cosmical and heliacal.