The anterior fixed or invertible portion of the scolex of a tapeworm, frequently provided with a row (or several rows) of hooks. [L. dim. of rostrum, a beak]
- armed r. r. with one or more rows of hooks.
- unarmed r. r. lacking hooks.
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ros·tel·lum rä-'stel-əm n an anterior prolongation of the head of a tapeworm often bearing hooks
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n. (pl. rostella)
a mobile and retractable knob bearing hooks, present on the head (scolex) of certain tapeworm, e.g. Taenia and Echinococcus.
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ros·tel·lum (ros-telґəm) pl. rostelґla [L. “little beakâ€] a small protuberance or beak, especially the fleshy protuberance of the scolex of a tapeworm, which may or may not bear hooks.Medical dictionary. 2011.