eucalyptus

Etymology

It is borrowed from New Latin Eucalyptus, the name of the genus,^[2][3][4][5] which the French botanist Charles Louis L'Héritier de Brutelle coined in 1788.^[3][6][2][7] He formed it from Ancient Greek εὐ- (eu-, “well”) and καλυπτός (kaluptós, “covered”),^[2][6][4][8] the verbal adjective of καλύπτω (kalúptō, “to cover, conceal”),^[6][2][9] as if from a Greek compound meaning "well covered".^[2][6] The name refers to the cap that covers and protects the flower bud before it opens.^{[2][9][10][8]} Barnhart relates the Greek verb to Latin cēlō (“to hide”) and Old English helan (“to cover”), from Proto-Indo-European *kel- (“to cover, conceal”),^[8][3] the root of hell.^[11]

Earliest recorded meaning

The genus of Australian gum trees, or a tree of that genus: 1809, in the Naval Chronicle.^[2][8] Etymonline dates the English word to 1789,^[3] Merriam-Webster Unabridged to 1801,^[11] and Dictionary.com to 1800–10.^[12]

Semantic evolution

Ayto notes that Europeans first met the trees in Australia at the end of the 18th century, shortly before L'Héritier named them.^[7] The name stayed close to the botanical sense, but from 1885 eucalyptus was also used by itself for eucalyptus oil, the medicinal oil distilled from the leaves.^[2] Skeat in 1911 explained the name by the hood that protects the stamens.^[13] The shortened form eucalypt is also used.^[14][12]

Timeline

• 1809 – the genus of Australian gum trees; a tree of this genus.^[2][8]
• 1885 – eucalyptus oil, used medicinally and industrially.^[2]

Meanings

Noun

1. Any of a large genus of tall evergreen trees and shrubs of the myrtle family, mostly native to Australia, valued for their timber, gums and oil; a gum tree.^[11][14][2]
2. Eucalyptus oil, the oil from its leaves, used in medicine and industry.^[2][14]
3. Used before another noun: of or made from eucalyptus wood or leaves.^[11]

Word family

• eucalyptic
• eucalyptol

Related words

• apocalypse
• Calypso
• eucalypt
• eu-
• hell
• conceal

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
6. ^ a b c d Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ a b Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
8. ^ a b c d e Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
9. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
10. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
11. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
12. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
13. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
14. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins