radium

Etymology

It is borrowed from French radium,^[2][3] named in 1898 by Pierre and Marie Curie,^[4][3] whose paper appeared in the “Comptes rendus” of the Académie des Sciences.^[2] Most dictionaries analyse the name as Latin radius (“ray, beam”) and the New Latin chemical suffix -ium,^{[5][4][6][7][8]} because the element gives off rays,^{[9][3][4][10]} while the revised OED takes it from the first syllable of radioactif (“radioactive”) and -ium.^[2] The French word was also borrowed as German Radium and Swedish radium.^[2]

Earliest recorded meaning

The radioactive metallic element: 1898, in the New York Sun of 28 December.^[2] Barnhart, Etymonline and Merriam-Webster Unabridged date the English word to 1899.^[4][3][5]

Semantic evolution

From 1904, in Rutherford's writing, radium with a following capital letter (radium A, radium B) named the substances formed in succession as radium decays, later identified as isotopes of other elements.^[2][11] In the same year the word appears for a fabric with a sheen.^[2] The OED sees a transfer from the element, which had an air of modernity after the Curies' Nobel Prize of 1903; the name seems to have begun as a brand name of the Gilbert Manufacturing Company, probably for an artificial silk, before passing into general use.^[2] Merriam-Webster Unabridged likewise derives the fabric's name from a trademark.^[5] Radium was also a brand name for hosiery in the United States in 1904 and for boot polish in the United Kingdom in 1909.^[2]

Timeline

• 1898 – the chemical element, in French and in English.^[2]
• 1904 – with a following capital letter, a product in the decay series of radium.^[2]
• 1904 – a plain woven fabric of silk or synthetic yarn.^[2]

Meanings

Noun

1. (chemistry) A highly radioactive white metallic element of the alkaline earth group, atomic number 88, symbol Ra, found in pitchblende and other uranium ores.^[12][5][2]
2. (chemistry) With a following capital letter, any of the substances formed in the decay series of radium, now known as isotopes of other elements.^[2][11]
3. A glossy, plain-woven cloth of silk or rayon, made into dresses and curtains.^[5][2][11]

Word family

• radon
• radium therapy

Related words

• radiation
• radioactive
• radioactivity
• radius
• ray

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o 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 c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
5. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
7. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
8. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
9. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
10. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
11. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
12. ^ Collins English Dictionary (2023), Glasgow: HarperCollins