Etymology
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tentacle (n.)

1762, from Modern Latin tentaculum, literally "feeler," from Latin tentare "to feel, try" + -culum, diminutive suffix (see -cule). Related: Tentacular.

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Definitions of tentacle

tentacle (n.)
something that acts like a tentacle in its ability to grasp and hold;
caught in the tentacles of organized crime
tentacle (n.)
any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals; used for feeling or grasping or locomotion;
From wordnet.princeton.edu