pe·ri·od·i·cal 
(pîr′ē-ŏdĭ-kəl)
(pîr′ē-ŏdĭ-kəl)adj.
1. Periodic.
2.
a. Published at regular intervals of more than one day.
b. Of or relating to a publication issued at such intervals.
n.
A publication issued at regular intervals of more than one day.