Pap smear

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A test for cancer, especially of the female genital tract, in which a smear of exfoliated cells is specially stained and examined under a microscope for pathological changes. Also called Pap test.

Wiktionary

1. n. gynaecology A screening test to detect pre-cancerous and cancerous cells by taking a sample (‘smear’) of cells from the cervix.

WordNet 3.0

1. n. a sample of secretions and superficial cells of the uterine cervix and uterus; examined with a microscope to detect any abnormal cells