[ al-duh-hahyd ]

  1. any of a class of organic compounds containing the group −CHO, which yields acids when oxidized and alcohols when reduced.

Origin of aldehyde

1840–50; <New Latin al(cohol) dehyd(rogenātum) dehydrogenated alcohol

Other words from aldehyde

  • al·de·hy·dic, adjective

Words Nearby aldehyde Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use aldehyde in a sentence

British Dictionary definitions for aldehyde


/ (ˈældɪˌhaɪd) /

  1. any organic compound containing the group -CHO. Aldehydes are oxidized to carboxylic acids and take part in many addition reactions

  2. (modifier) consisting of, containing, or concerned with the group -CHO: aldehyde group or radical

Origin of aldehyde

C19: from New Latin al (cohol) dehyd (rogenātum) dehydrogenated alcohol

Derived forms of aldehyde

  • aldehydic (ˌældəˈhɪdɪk), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for aldehyde


[ ăldə-hīd′ ]

  1. Any of a class of highly reactive organic compounds obtained by oxidation of certain alcohols and containing the group CHO. Aldehydes are used in manufacturing resins, dyes, and organic acids.

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