renninogen en · NOUN
Etymology
From rennin + -o- + -gen.
Meanings
-
(obsolete, uncountable) Synonym of prochymosin.
In cases where the acidity of the gastric contents is low, and also the ferment activity, I have found that frequently most of the ferment is present as renninogen and not as rennin.
1908 July 25, W. H. Wilcox, “The importance and significance of the chemical examination of the gastric contents after a test meal, with a new method for estimating the ferment activity of the gastric contents”, in The Lancet, page 223: