Meaning

noun a small constellation in the southern hemisphere near Dorado and Hydrus

noun any fine network (especially one in the body composed of cells or blood vessels)

noun the second compartment of the stomach of a ruminant

originNamed by the French astronomer Nicolas Louis de Lacaille in 1763. From later Latin rēticulum (“reticle”). The meaning is often wrongly interpreted as "net", which is an older meaning of the Latin root word. Doublet of reticle, reticule, and reticulum.

Etymology from Wiktionary, CC BY-SA 3.0