From ZooTerms (Dictionary of Invertebrate Zoology)
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rhabdoid (noun; Greek rhabdos, rod; eidos, like): 1. Rod-like; any rod-shaped body.

2. (Cnidaria) Nematocysts that open at the tip with a definite cylindrical hempe.

3. (Platyhelminthes: Turbellaria) A group of epidermal and subepidermal inclusions (rhabdites, rhammites, and chondrocysts), consisting of a ridged hull filled with a semifluid material.