The protuberant anterior part of the scolex of certain tapeworms. May be unarmed or armed with rows of hooklets. Health Source: Dictionary of Tropical Medicine Author: Health Dictionary
n. (pl. rostella) a mobile and retractable knob bearing hooks, present on the head (scolex) of certain *tapeworms, e.g. Taenia and Echinococcus. Health Source: Oxford | Concise Colour Medical Dictionary Author: Jonathan Law, Elizabeth Martin
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