"Resembling a rod; rod-shaped, rodlike; ( Zoology ) of or relating to rod-like structures secreted by turbellarian flatworms", Mid 19th cent.; earliest use found in Robert Mayne (1808–1868). From post-classical Latin rabdoides from Hellenistic Greek ῥαβδοειδής striped from ancient Greek ῥάβδος rod + -οειδής.[rhabdoid etymology, rhabdoid origin, 英语词源]