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.
Common reeds can also be trimmed and fired to make crude charcoal pencils or pen nibs, and they can be pulped to make a coarse form of paper, as well. The reed which lends its name to the reeds in musical instruments is Arundo donax, the giant reed.ommon reeds can also be trimmed and fired to make crude charcoal pencils or pen nibs, and they can be pulped to make a coarse form of paper, as well. The reed which lends its name to the reeds in musical instruments is Arundo donax, the giant reed.