{ A‐cron″yc (�), A‐cron″ych‐al (�), } a. [Gr. ακρὄνυχοσ at nightfall; ἄκροσ + νύξ night.] (Astron.) Rising at sunset and setting at sunrise, as a star; — opposed to cosmical.
☞ The word is sometimes incorrectly written acronical, achronychal, acronichal, and acronical.