arolium
/əˈrəʊlɪəm/Zoology (chiefly Entomology )
noun
In the feet of various arthropods, especially insects and mites: a membraneous pad or lobe located between the tarsal claws, assisting in gripping surfaces.
Origin
Mid 19th century. From scientific Latin arolium, of uncertain origin; perhaps from post-classical Latin arolius, arrolius roll of cloth from Spanish arrollar to roll, earlier form of arrojar + classical Latin -ius, suffix chiefly forming adjectives.