A slender process for feeling, prehension, or locomotion in invertebrates. [Mod. L. tentaculum, a feeler, fr. tento, to feel]
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ten·ta·cle 'tent-i-kəl n any of various elongate flexible usu. tactile or prehensile processes borne by animals chiefly on the head or about the mouth esp one of the threadlike processes bearing nematocysts that hang down from the margin of the umbrella of many jellyfishes
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ten·ta·cle (tenґtə-kəl) a slender whiplike appendage in animals that may function in prehension and feeding or as a sense organ.Medical dictionary. 2011.