You searched for: “acronych
Happening in the evening or at night-fall, vespertine, as the acronychal rising or setting of a star. Sometimes this term is used as if “rising in the evening or at sunset and setting at sunrise”; but this is not correct. When the rising is acronychal, the setting is cosmical, and vice versa. (According to the Oxford English Dictionary).
This entry is located in the following units: acro-, acr- (page 6) -al; -ial, -eal (page 6)