rostellum
/rɒˈstɛləm/noun
1In certain plants, especially orchids: a beak-like projection at the base of the stigma which serves to separate the stigma and anther and to prevent self-pollination of the plant.
2The protruding forepart of the head of a tapeworm, typically armed with hooklets or spines.
Origin
Mid 18th century (in an earlier sense). From post-classical Latin rostellum, specific uses of classical Latin rostellum small beak or snout (Pliny) from rostrum beak + -ellum.