Presenting Part

In obstetrics, the portion of the fetus that is closest to the birth canal and which can be felt through the cervix during a vaginal examination. Doctors and midwives use the presenting part to determine which position the fetus is lying in during labor.
Found on http://www.pregnology.com/AZ/P/9

Presenting part

The part of the baby's body that is facing down during labor
Found on http://www.whattoexpect.com/pregnancy/glossary/p.aspx
No exact match found