Quiz: Remember the definition of mal de mer?
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.