tentacle

Etymology

It is borrowed from New Latin tentāculum (“feeler”),^[2][3][4][5] anglicized in its ending.^[6][7][8] The New Latin word is formed from Latin tentō (“to feel, try”),^[2][3][9] a variant of temptō,^[10][11][7] the source of tempt,^[2][4][12] with -culum, which Etymonline and Barnhart call a diminutive suffix^[2][3] and Merriam-Webster Unabridged a suffix denoting an instrument.^[13] Tentative comes from the same Latin verb.^[8]

Earliest recorded meaning

A slender, flexible organ of touch in an animal: Etymonline dates the English form to 1755, after the New Latin tentaculum used in English from 1752.^[2][5] Barnhart and Merriam-Webster Unabridged date the word to about 1762,^[3][13] and the OED's first record is 1764, in the Philosophical Transactions of the Royal Society.^[5]

Semantic evolution

The word was first a term of zoology, for the feelers of animals, especially invertebrates;^[5][2] Skeat still glosses it as the feeler of an insect.^[14] Later dictionaries stress grasping as well as touch: the limb is also used for feeding, for moving about and for seizing.^[10][9][6] A figurative use appeared in 1847, in De Quincey, for a means of feeling out or reaching towards something,^[5] and it has come to suggest an insidious binding force or a channel for gathering information in secret.^[6] In 1875 Darwin's Insectivorous Plants applied the word to the sensitive, gland-tipped hairs of the sundew.^[5] Etymonline dates the derivatives tentaculate to 1804 and tentacular to 1828.^[2]

Timeline

• 1755 – an elongated, flexible organ of an animal.^[2] The OED's first record of this sense is 1764.^[5]
• 1847 – figurative, a feeler, in De Quincey.^[5]
• 1875 – in botany, a sensitive hair on a leaf, in Darwin.^[5]

Meanings

Noun

1. (zoology) A long, flexible organ near the mouth or on the head of many invertebrates, used for feeling, grasping, feeding or moving: A sea anemone draws its prey in with its tentacles.^{[9][10][13][5]}
2. (zoology) In a cephalopod, a retractile limb with a club-shaped end, as opposed to an arm, which has suckers along its length.^[9]
3. (botany) A sensitive, sticky hair on the leaf of an insectivorous plant such as the sundew, used to trap prey.^[10][5]
4. Something likened to a tentacle in its reach or grip, especially a means of control or of gathering information in secret: the tentacles of the old regime.^[10][6][5]

Word family

• tentacular
• tentacled
• tentaclelike

Related words

• tempt
• tentative
• attempt
• tentaculum

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ a b c d e f g h i j k l Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
6. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
7. ^ a b Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
8. ^ a b Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
9. ^ a b c d The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
10. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
11. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
12. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
13. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
14. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press