The periodic agony that accompanies sickle cell was joined by the torment of persistent eye infections and repeated surgeries.
The Summit of the Americas is a periodic meeting of heads of government of countries located in the Western Hemisphere.
They calculated that every periodic inspection would cost each carrier $1,275 per airplane.
1640s, from French périodique (14c.), from Latin periodicus, from periodus (see period).
Periodic table in chemistry (1889) is from notion of the arrangement, in which similar properties recur at intervals in elements in the same area as you read down the rows of the table. This sense of the word is attested from 1872 (periodic law).
periodic pe·ri·od·ic (pĭr'ē-ŏd'ĭk)
Having or marked by repeated cycles.
Recurring at regular intervals.