acid·​ic | \ə-ˈsi-dik, a-\

Definition of acidic 

1 : acid-forming

2 : acid

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Examples of acidic in a Sentence

The soil in our garden is very acidic. the acidic water of a polluted lake

Recent Examples on the Web

Every bite is fragrant, fresh and well-balanced by a bright acidic dressing with a salty, limey finish. Anchorage Daily News, "Dimond Pho dishes up flavors from Thailand and Vietnam in South Anchorage," 14 Feb. 2018 Like other coral reefs around the world, Australia’s Great Barrier Reef is facing big threats from climate change — such as warmer and more acidic seawater and increased ultraviolet (UV) radiation from the sun. Amanda Campanaro /, NBC News, "Can this ultra-thin 'sunscreen' save the world's largest coral reef?," 5 Apr. 2018 Carolyn Murphy: The Alkaline Diet An alkaline diet, which limits acidic foods in an effort to alter the body’s pH level, is high in fruits, vegetables, nuts, and legumes and low in meat, fish, dairy, eggs, grains, and alcohol. Elizabeth Inglese, Vogue, "Eat Like a Supermodel! 5 Healthy Food Plans Behind the World’s Best Bodies," 28 June 2018 Do not leave food, especially acidic foods like spaghetti sauce, in your cast iron for more than a short time after cooking. Good Housekeeping, "Everything You Need To Know About Seasoning And Caring For Your Cast-Iron Pans," 1 Nov. 2017 Only use this on tough spots and sparingly so — vitamin C is highly acidic and can sensitize your skin if overused at this concentration. Ashley Weatherford, The Cut, "Everything at Paula’s Choice Is on Sale Right Now," 13 June 2018 Substances with a pH less than 7 are acidic and those above 7 are alkaline. Casey Quackenbush, Time, "Google Doodle Celebrates S.P.L. Sørensen, the Trailblazing Chemist Behind the pH Scale," 29 May 2018 The ocean is becoming more acidic, which threatens some plankton. James Gorman, New York Times, "The Ruthless Phronima, and Other Hidden Wonders of the Sea," 22 Mar. 2018 Minor, inconsequential, wan, harshly acidic are among the ways it is usually described — fit only as the base wine for a kir, an aperitif made by blending it with crème de cassis. Eric Asimov, New York Times, "The Aligoté Defense Rests," 28 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'acidic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of acidic

1866, in the meaning defined at sense 1

History and Etymology for acidic

acid entry 1 + -ic entry 1

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Statistics for acidic

Last Updated

2 Nov 2018

Look-up Popularity

Time Traveler for acidic

The first known use of acidic was in 1866

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More Definitions for acidic



English Language Learners Definition of acidic

: having a very sour or sharp taste

: containing acid


acid·​ic | \ə-ˈsid-ik, a- \

Medical Definition of acidic 

1 : acid-forming

2 : acid

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Comments on acidic

What made you want to look up acidic? Please tell us where you read or heard it (including the quote, if possible).


playful or foolish behavior

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