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|Noun||1.||invertebrate foot - any of various organs of locomotion or attachment in invertebrates|
invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification
tube foot - tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration
organ - a fully differentiated structural and functional unit in an animal that is specialized for some particular function