ductus arteriosus
- n a blood vessel in a fetus that bypasses pulmonary circulation by connecting the pulmonary artery directly to the ascending aorta; normally closes at birth
ductus deferens
- n a duct that carries spermatozoa from the epididymis to the ejaculatory duct
dude
- n an informal form of address for a man
- n a man who is much concerned with his dress and appearance
dude ranch
- n a holiday resort offering ranch activities (riding and camping)