A sill is an intrusive rock formation. These formations occur when magma solidifies underground and then intrudes into the overlying rock formation. They are distinct from similarly formed domes and dikes because sills are horizontal to the surface.
The Papanicolaou test (abbreviated as Pap test, known earlier as Pap smear, cervical smear, or smear test) is a method of cervical screening used to detect potentially pre-cancerous and cancerous processes in the cervix (opening of the uterus or womb). Pap smear is performed by opening the vaginal canal with a speculum, then collecting cells at the outer opening of the cervix at the transformation zone (where the outer squamous cervical cells meet the inner glandular endocervical cells).
A Pap smear (also known as a Pap test) is useful in detecting, preventing, and treating cervical cancer. A Pap smear allows for the early detection of abnormal cells on the cervix - cells that may develop into cancer in the future. Cells are examined with a microscope in order to see any abnormalities. Pap tests are usually done at the doctor's office. Sometimes a nurse is present to observe or assist with the test.