The Collaborative International Dictionary
Rhabdom
Rhabdom \Rhab"dom\ (r[a^]b"d[o^]m), n. [Gr. "ra`bdwma a bundle of rods, fr. "ra`bdos a rod.] (Zo["o]l.) One of numerous minute rodlike structures formed of two or more cells situated behind the retinul[ae] in the compound eyes of insects, etc. See Illust. under Ommatidium.
Wiktionary
rhabdom
n. Any of the rods that support each ommatidium in the compound eye of arthropods