Source : Webster's Revised Unabridged Dictionary (1913)

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}.