/ Dictionary / Index R reticulum: Meaning and Definition of Find definitions for: re•tic•u•lum Pronunciation: (ri-tik'yu-lum), [key] — pl. gen. -la -li a network; any reticulated system or structure. a network of intercellular fibers in certain tissues. a network of structures in the endoplasm or nucleus of certain cells. the second stomach of ruminating animals, between the rumen and the omasum. See diag. under (cap.)the Net, a southern constellation between Dorado and Hydrus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: reticulum (Thesaurus) reticuloendothelial system retiform Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language