A chemical formula that indicates the simplest numerical ratio of the elements within a molecule, without demonstrating the molecule's chemical bonds or structure. For example, the empirical formula for water is H2O. Synonym: molecular formula.
Pelvic inflammatory disease (PID) is an infection caused by bacteria. When bacteria from the vagina or cervix travel to your womb, fallopian tubes, or ovaries they can cause an infection. Most of the time, PID is caused by bacteria from chlamydia and gonorrhea. These are sexually transmitted infections (STIs). Having unprotected sex with someone who has an STI can cause PID.
Pelvic inflammatory disease (PID) is a general term for an infection that affects the lining of the uterus (endometritus), the fallopian tubes (salpingitis), and/or the ovaries (oophoritis). It is caused primarily by sexually transmitted infections that spread up from the opening of the uterus to these organs.