Also found in: Thesaurus, Medical, Legal, Encyclopedia.
(Gynaecology & Obstetrics) 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 or mucus method
[C20: devised by Drs John and Evelyn Billings in the 1960s]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014