(anatomy) A stem attaching a mass of tissue (such as a polyp) to the body.
(zoology) A collection of nerves in the appendage of an animal (such as the tip of a dolphin's tail).
Esimerkit
On fertilization, the archegonia form obyriform calyptrae that are distinctly narrowed at base to form a stalk or peduncle; this does not occur in other Hepaticae.