tannic acid


Examples of tannic acid in a Sentence

Recent Examples on the Web By mixing iron sulfate with tannic acid (which Little derives from cooking the plant sumac), the ink gets its deep shade, which darkens on the paper’s surface once exposed to oxygen. Jacqui Palumbo, CNN, 28 Mar. 2024 Redwoods, a notable exception, are considered fire-resistant due to the tannic acid in their bark. Jessica Damiano, San Diego Union-Tribune, 26 Aug. 2023 The bark of these trees contains tannic acid, which helps their bark stay safe from flames. Li Cohen, CBS News, 22 Aug. 2023 Ground gall nuts, taken from an oak-like tree, were boiled to draw out tannic acid, which was mixed with iron sulfate scraped from nails. Joe Pappalardo, Popular Mechanics, 3 July 2020 Add a pinch of baking soda to neutralize the tannic acid in the brew. Jenny Comita, Better Homes & Gardens, 16 Apr. 2021 Don’t worry about the tannic acid in the leaves, our alkaline, highly buffered soils are not negatively affected. Calvin Finch, ExpressNews.com, 2 Jan. 2020 Used tea grounds and fresh tea leaves contain nutrients and tannic acid that, when added to the soil, create a more fertile environment for garden, landscape and container plants. OregonLive.com, 10 Feb. 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'tannic acid.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1836, in the meaning defined above

Time Traveler
The first known use of tannic acid was in 1836

Dictionary Entries Near tannic acid

Cite this Entry

“Tannic acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tannic%20acid. Accessed 21 Jun. 2024.

Kids Definition

tannic acid

tan·​nic acid
: tannin

Medical Definition

tannic acid

tan·​nic acid ˌtan-ik- How to pronounce tannic acid (audio)
: a tannin occurring especially in extracts from nutgalls and yielding gallic acid on hydrolysis

called also digallic acid, gallotannic acid, gallotannin


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