tannin
- Noun:
- A type of complex phenolic compound found in plants: "Tannin" refers to any of various naturally occurring, astringent chemical substances derived from plants. These compounds are characterized by their ability to bind to and precipitate proteins.
- A substance used in tanning and medicine: Historically and industrially, tannins are crucial for converting animal hides into leather (tanning) and have applications in traditional and modern medicine due to their astringent properties.
- Noun:
- The bitterness in red wine is often due to the presence of tannin from grape skins.
- Oak barrels impart tannin to the whiskey during the aging process.
- Traditional leather production relies on extracting tannin from tree bark.
"Tannin content": A phrase used to describe the amount or concentration of tannins in a substance, such as tea, wine, or fruit.
- The high tannin content in this black tea gives it a strong, dry mouthfeel.
"Hydrolyzable tannin" vs. "Condensed tannin": Technical terms classifying tannins based on their chemical structure and behavior.
- Hydrolyzable tannins, like those found in oak galls, break down in water to release gallic acid.
Tannic (adj): Relating to, containing, or derived from tannin.
- The river had a tannic acid stain from the fallen leaves.
Tannate (n): A salt or ester of tannic acid.
- Polyphenol: A broader class of plant compounds that includes tannins.
- Astringent: A substance that causes contraction of body tissues; describes the primary sensory effect of tannins.
"To be rich in tannins": Describes a substance containing a significant amount of tannin.
- Young, bold red wines are typically rich in tannins.
"Tannin extraction": The process of obtaining tannins from plant material.
- The temperature and duration of steeping affect tannin extraction in tea.
(Note: As a specific chemical term, "tannin" itself is not commonly used in idiomatic expressions. Idioms would more likely involve the related concept of "tanning" or the sensory effect "astringent.")
-
any of various complex phenolic substances of plant origin; used in tanning and in medicine
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