Billings method

noun

a natural method of birth control that involves examining the colour and viscosity of the cervical mucus to discover when ovulation is occurringAlso called: ovulation method, mucus method

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Word Origin for Billings method

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012