definition of cow reticulum
reâ¢ticâ¢uâ¢lum. 1. a network; any reticulated system or structure. 2. a. a network of intercellular fibers in certain tissues. b. a network of structures in the endoplasm or nucleus of certain cells. 3. the second stomach of cows and other ruminants, into which the coarse food regurgitated from the rumen is reswallowed.