hebdomicallyadv.
Etymology: < Greek ἕβδομος seventh + -ic suffix + -al suffix1 + -ly suffix2.Previous versions of the OED give the stress as: hebˈdomically.
1837 W. Whewell I. 292 The intellectual gods produce all things hebdomically.
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2019).