the·​a·​nine | \ ˈthē-ə-ˌnēn How to pronounce theanine (audio) \
variants: or L-theanine \ ˈel-​ˈthē-​ə-​ˌnēn How to pronounce L-theanine (audio) \

Definition of theanine

: an amino acid C7H14N2O3 found especially in green tea and used as a dietary supplement Green tea, which is rich in a depression-fighting amino acid called theanine, has previously been lauded for its health benefits.— Camilla Turner

Examples of theanine in a Sentence

Recent Examples on the Web

Fans of the sparkling water craze will love this — Recess, a sparkling water beverage infused with CBD and other buzzy ingredients (including ginseng, L-theanine, and Schisandra), aims to refresh you on both a physical and mental level. Allure, "12 CBD Tinctures, Gummies, and Drinks That Help Calm Anxiety," 23 Oct. 2018 Another option is Solliquin, a supplement containing calming natural ingredients like l-theanine (found in green tea), magnolia, phellodendron, and whey protein concentrate. Stephanie Eckelkamp, Good Housekeeping, "9 Tips For Keeping Your Pet Calm And Safe During Fireworks," 30 June 2017 The amino acid L-theanine and caffeine are also found in green tea — a combination that promotes brain function and energy. Spoon U, Teen Vogue, "How to Make a Starbucks Green Tea Lemonade," 29 July 2017 A cup of decaffeinated tea, rich in stress-reducing theanine, is a perfect bedtime ritual. By Sheah Rarback, miamiherald, "Not getting enough sleep? It could explain your weight gain," 30 May 2017 One is an amino acid only found in tea, called l-theanine, which in the last decade has been added to drinks that promote focus and concentration. Ben Guarino, The Denver Post, "The tea plant has a whopper genome, four times that of coffee, scientists find," 2 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'theanine.' 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 theanine

1950, in the meaning defined above

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Time Traveler for theanine

The first known use of theanine was in 1950

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to wander slowly or to speak indistinctly

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