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1650s, "second stomach of a ruminant" (so called from the folds of the membrane), from Latin reticulum "a little net" (see reticulate (adj.)). The word was later given various uses in biology, cytology, histology, etc., and made a southern constellation by La Caille (1763).
reticulum re·tic·u·lum (rĭ-tĭk'yə-ləm)
n. pl. re·tic·u·la (-lə)
A fine network formed by cells, by certain structures within cells, or by connective-tissue fibers between cells.
The second compartment of the stomach of ruminant mammals, lined with a membrane having honeycombed ridges.
The second division of the stomach in ruminant animals, which together with the rumen contains microorganisms that digest fiber. The reticulum's contents are regurgitated for further chewing as part of the cud. See more at ruminant.