“In front of the elbow” in Latin. The hollow in the crook of your arm in front of the elbow, with its easily accessible veins, is frequently used to insert a needle to draw blood.
The cubit, an archaic unit of measurement, is the distance from the elbow to the tip of the middle finger, approximately 18 inches. Noah’s ark was specified to be 300 cubits in length (Genesis 6:15).