variants or Chaga mushroom or less commonly chaga or chaga mushroom
plural Chaga or Chagas or Chaga mushrooms
: the dark brown to black, irregularly shaped, sterile, mycelial mass of a fungus (Inonotus obliquus of the family Hymenochaetaceae) that grows parasitically chiefly on hardwood trees and especially birch in temperate climates of the northern hemisphere

Note: The Chaga has a hard, deeply cracked surface said to resemble charred wood and a yellow- to orange-brown, somewhat fleshy interior. It has a bitter taste and is used mainly in folk medicine and as an herbal supplement.

It takes years for Chaga to show itself after growing inside the tree, a phenomenon which is rare in mushrooms. Ella Wilson
Because chaga in its raw form is not the most digestible of Mother Nature's bounty, it's usually ground up and brewed as tea. EmmaJean Holley

Examples of Chaga in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This could be extra vitamin C (1,000 mg), glutathione, or even Chaga mushroom extract. Emily Peck, WIRED, 31 Dec. 2024 The brand combines liquid mushroom elixirs like Lion’s Mane, Chaga, Reishi, Cordyceps or Turkey Tail into the coffees to enhance their health and energy-giving benefits. Bianca Salonga, Forbes, 26 Dec. 2024

Word History

Etymology

borrowed from Russian čága, borrowed from Komi (Finno-Ugric language of northeast European Russia) čaga, čaka "fungus growing on a tree (as a pore fungus), tinder"

First Known Use

1957, in the meaning defined above

Time Traveler
The first known use of Chaga was in 1957

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Cite this Entry

“Chaga.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Chaga. Accessed 25 Mar. 2025.

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