† periodoscopen.
Obstetrics. Obsolete. rare.
A chart for estimating the date on which a pregnant woman will go into labour, calculating from the date of her last period.
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periodoscope1848
1848 W. T. Smith (title) The periodoscope, with its application to obstetric calculations and the periodicities of the sex.
1893 New Sydenham Soc. Lexicon Periodoscope, Obstet., a dial, constructed to help in calculating the day on which labour will most probably occur, invented by Tyler Smith.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online June 2018).
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n.1848- cross-river
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