{ A*cron"yc (?), A*cron"ych*al (?), }
a. [Gr. 'akro`nychos at nightfall;
'a`kros + ny`x 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.