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The Collaborative International Dictionary
Tentaculum

Tentaculum \Ten*tac"u*lum\, n.; pl. Tentacula. [NL. See Tentacle.]

  1. (Zo["o]l.) A tentacle.

  2. (Anat.) One of the stiff hairs situated about the mouth, or on the face, of many animals, and supposed to be tactile organs; a tactile hair.

Wiktionary
tentaculum

n. 1 (context zoology English) A tentacle. 2 (context anatomy English) One of the stiff hairs situated around the mouth, or on the face, of many animals, and supposed to be tactile organs.