adv. In an acronycal manner as rising at the setting of the sun, and vice versa. [ 1913 Webster ]

{ } 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. [ 1913 Webster ]

☞ The word is sometimes incorrectly written acronical, achronychal, acronichal, and acronical. [ 1913 Webster ]

a. [ Gr. 'akro`nyktos; 'a`kros + ny`x, nykto`s, night. ] (Astron.) Acronycal. [ 1913 Webster ]