parotid vein: parotid branches of the facial vein; they drain part of the parotid gland and empty into the retromandibular vein
vein: a blood vessel that carries blood from the capillaries toward the heart
cystic fibrosis: the most common congenital disease; the child's lungs and intestines and pancreas become clogged with thick mucus; caused by defect in a single gene; no cure is known