- The definition of a tube foot is a fleshy tube that extends from the body of hard, spiny skeleton marine animals, used for movement, breathing and catching food.
An example of a tube foot is one of the five appendages of a starfish.
any of numerous small, water-filled, fleshy tubes in most echinoderms, projecting outside the body, often ending in a suction disc, and used in locomotion, securing food, etc.
One of the numerous external, fluid-filled muscular tubes of an echinoderm, such as a starfish or sea urchin, serving as organs of locomotion, food handling, and respiration.
(plural tube feet)