condenser

Etymology

It is formed from English condense + -er, an agent noun.^[1][2][3][4] The OED and the Shorter Oxford compare French condenseur.^[1][3] The verb is from Old French condenser or directly from Latin condēnsō (“to make dense”),^[2] formed from com- and dēnsō (“to make thick”), from dēnsus (“thick, dense”).^[2]

Earliest recorded meaning

Something that makes dense, packs into a smaller space or intensifies: 1686, in J. Goad's Astro-meteorologica.^[1] Merriam-Webster Unabridged also dates the word to 1686,^[5] and Etymonline to the 1680s.^[2]

Semantic evolution

Etymonline notes that the word took on a wide variety of technical uses in the late 18th and 19th centuries.^[2] Johnson (1755) knew it only as a strong metal vessel into which air was forced with a syringe,^[6] and the OED records this air-compressing sense from 1728.^[1] In 1769 James Watt's patent used it for the chamber of a steam engine where steam is condensed into water after leaving the cylinder,^[1] and the general sense of something that turns vapour into liquid, usually by cooling, followed, with uses in gasworks (1809) and distilling (1874).^[1] In 1782 Volta used it for an apparatus that stores or intensifies an electric charge,^[1] a sense now largely replaced by capacitor.^[1][7] In optics, from 1798, it is a lens or set of lenses that concentrates light on an object.^[1] In the Yorkshire woollen trade a condenser was a machine that turned the raw material into a thread ready for spinning,^[8] and the OED records the machine from 1862.^[1] A person who abridges a literary work has been called a condenser since 1868.^[1][5]

Timeline

• 1686 – that which makes dense, compresses or intensifies.^[1]
• 1728 – pneumatics, an apparatus for compressing air.^[1]
• 1769 – the chamber of a steam engine in which steam is condensed.^[1]
• 1782 – an apparatus for accumulating an electric charge.^[1]
• 1798 – optics, a lens that concentrates light.^[1]
• 1809 – gasworks, an apparatus that separates tar and other substances from gas by cooling.^[1]
• 1860 – that which reduces vapour to liquid.^[1]
• 1862 – wool manufacture, a machine that rolls slivers from the carding machine into slubbings.^[1]
• 1868 – a person who abridges literary works.^[1]
• 1874 – distilling, the part of the apparatus in which the vapour is condensed.^[1]

Meanings

Noun

1. An apparatus that turns a gas or vapour into a liquid or solid by removing heat, as in a steam engine, a still or a refrigerator.^[7][5][1]
2. A lens, or set of lenses or mirrors, that concentrates light on an object, as in a microscope.^[7][5][1]
3. Another word for a capacitor.^[7][5][1]
4. A person or thing that condenses, especially one who abridges written works.^[7][5][1]
5. A device for compressing air; a compressor.^[5][1]
6. In wool manufacture, a machine that takes the web from the carding machine and forms it into strands for spinning.^[5][1]

Word family

• Abbe condenser

Related words

• condense
• condensation
• dense
• capacitor

References

1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
2. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
4. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
5. ^ a b c d e f g h Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
7. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
8. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)