13-letter words containing d, u, l, t
- wolffian duct — a duct, draining the mesonephros of the embryo, that becomes the vas deferens in males and vestigial in females.
- zero altitude — the height at which the atmospheric pressure is 610.5Pa
- zygodactylous — Also, zygodactylous. (of a bird) having the toes of each foot arranged in pairs, with two toes in front and two behind.