1. The head of a tapeworm, with suckers or hooks that enable the parasitic worm to attach itself to its host.
2. The knoblike anterior end of a tapeworm, having suckers or hooklike parts that in the adult stage serve as organs of attachment to the host on which the tapeworm is parasitic.
3. The head of a tapeworm either in the larva or adult stage; or the embryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm.