pepsinogen. a zymogen secreted by the chief cells of the gastric glands and converted into pepsin in the presence of gastric acid or of pepsin itself.plasma pepsinogen. high levels are indicative of extensive mucosal damage in the abomasum, as in ostertagiasis in ruminants. proenzyme formed and secreted by the chief cells of the gastric mucosa; the acidity of the gastric juice and pepsin itself remove 42 amino acid residues from pepsinogen to form active pepsin. Synonym(s): propepsin. [ pepsin + G. -gen, producing].
Princeton's WordNet(5.00 / 1 vote)Rate this definition: 1  reed(noun) tall woody perennial grasses with hollow slender stems especially of the genera Arundo and Phragmites.
rainstick. play pause. mute unmute. The rainstick is a percussion instrument that can be classified as a shaken idiophone. The rainstick is generally used to create the sound effects of rain or, when shaken, a sound similar to the maracas.It consists of a long, hollow tube, capped at both ends and filled with small pellets of some sort (possibly pebbles, sand, seeds, dried beans, etc.).umerous small pins are placed along the length of the inside of the tube and are arranged inwards toward the center of the tube. When the rainstick is turned end over end, the pellets fall to the opposite end of the tube, creating the sound of a rain storm as they bounce off the pins.