American Heritage® Dictionary of the English Language, Fourth Edition
- n. A transparent rod in the center of each ommatidium in the compound eye of an arthropod.
Century Dictionary and Cyclopedia
- n. In entomology, a special structure in the eye, consisting of a concrescence of the rods developed on the cells of the retina, when these cells are themselves united in a retinula.
GNU Webster's 1913
- n. (Zoöl.) One of numerous minute rodlike structures formed of two or more cells situated behind the retinulæ in the compound eyes of insects, etc. See
- From Greek rhabdōma, bundle of rods, from Greek rhabdos, rod; see rhabdomancy. (American Heritage® Dictionary of the English Language, Fourth Edition)
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