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Synonyms

acidic

American  
[uh-sid-ik] / əˈsɪd ɪk /

adjective

  1. acid.

  2. Geology. acid.

  3. acid-forming.

  4. containing acid-bearing pollutants.

    Acidic runoff is poisoning the nation's rivers.
acidic British  
/ əˈsɪdɪk /

adjective

  1. another word for acid

  2. (of an oxide) yielding an acid in aqueous solution

"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

Other Word Forms

  • nonacidic adjective
  • semiacidic adjective
  • unacidic adjective

Etymology

Origin of acidic

First recorded in 1875–80; acid + -ic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Earlier restorers cut it into six sections, adhered it to acidic backing and sealed it with animal glue.

From The Wall Street Journal • Mar. 30, 2026

Those distracting acidic greens are only one unusual choice in Pontormo’s palette.

From The Wall Street Journal • Mar. 27, 2026

For this process to work properly, lysosomes must maintain an acidic environment.

From Science Daily • Mar. 26, 2026

“It’s not acidic or negative. I genuinely love doing this,” he says.

From Los Angeles Times • Mar. 6, 2026

An acidic sap dripped from the cut vines and burned where it landed on his arm.

From "Messenger" by Lois Lowry

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.