galactic

Etymology

It is borrowed from Ancient Greek γαλακτικός (galaktikós, “milky”),^[2][3][4][5] through Late Latin galacticus in the sense "of the Milky Way",^[6][7] from γάλα (gála, “milk”), genitive γάλακτος (gálaktos),^[4][2] which is probably related to Latin lac (“milk”).^[2][4] In its first, chemical sense it follows French galactique, recorded in 1782 in acide galactique;^[2] in the astronomical sense it follows galaxy, and the OED compares New Latin galacticus, used so in 1754.^[2] The Oxford Dictionary of English and the SOED instead form it from a variant of the Greek word for the galaxy with the suffix -ic.^[8][9]

Earliest recorded meaning

In chemistry, relating to milk, in galactic acid, an old name for lactic acid: 1788, in Nicholson's translation of Fourcroy's Elements.^[2]

Semantic evolution

The milk sense, now rare, was soon overtaken by the astronomical one: of or relating to the Milky Way, from 1834 according to the OED and MWU,^[2][7] or 1839 according to Etymonline.^[6] The word also came to mean "of or relating to any galaxy" (Etymonline dates the modern sense from 1849).^[2][6] In the 20th century it took extended senses: illustrious, full of celebrities (1902), and vast or enormous (1960).^[2][7]

Timeline

• 1788 – in chemistry, relating to milk (galactic acid).^[2]
• 1834 – of or relating to the Milky Way.^[2][7]
• 1839 – of the Milky Way, according to Etymonline.^[6]
• 1849 – of or relating to the Galaxy, in the modern scientific sense.^[6]
• 1902 – illustrious, featuring many celebrities.^[2]
• 1960 – vast, enormous.^[2]

Meanings

Adjective

1. Of or relating to a galaxy, especially the Milky Way: the galactic plane.^[3][7][2]
2. (informal) Extremely great; huge: The project ran up a galactic bill.^[7][2]
3. (rare) Of or relating to milk.^[3][2]

Word family

• extragalactic
• intergalactic
• intragalactic
• nongalactic
• galactic year

Related words

• galaxy
• lactic
• lacteal
• lettuce

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
4. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
7. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
8. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
9. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press