birth control pill

contraceptive pill noun a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception
Found on http://wordnetweb.princeton.edu/perl/webwn?s=birth%20control%20pill

Birth Control Pill

The pill is one of the most common types of birth control for women. When the pill is taken correctly, it is more than 99% effective at preventing an unplanned pregnancy. Oral contraceptives have two hormones-estrogen and progestin. These hormones do not allow your body to ovulate. The pill is easy to use and does not interfere at all with your sex
Found on http://www.pregnology.com/AZ/B/3

birth control pill

A pill used to prevent pregnancy. It contains hormones that block the release of eggs from the ovaries. Most birth control pills include estrogen and progestin. Also called oral contraceptive pill.
Found on http://www.cancer.gov/dictionary?expand=B
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