"Nuchal translucence" refers to a medical measurement used in prenatal screening. It involves the thickness of a clear or translucent space at the back of a developing fetus's neck. This measurement is obtained through an ultrasound scan during the first trimester of pregnancy and can help assess the risk of certain chromosomal abnormalities, such as Down syndrome. A thicker nuchal translucence measurement may indicate an increased likelihood of these conditions, prompting further diagnostic testing and counseling for expectant parents.