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Billings method

noun
1.
a natural method of birth control that involves examining the colour and viscosity of the cervical mucus to discover when ovulation is occurring Also called ovulation method, mucus method
Word Origin
C20: devised by Drs John and Evelyn Billings in the 1960s
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for billings method
noun

a medical system for determining the time of ovulation based on cervical mucus, esp. as a form of birth control or for conception

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