Definition

1. Noun (Botany, Pharmacy):
   • Gall-nut: A hard, round, or irregular growth formed on the leaves, twigs, or buds of certain trees, especially oaks, in response to the activity of insect larvae (such as gall wasps). These galls are rich in tannic acid and have been used historically in dyeing, tanning, and traditional medicine.

Usage Examples

• Noun:
  • Ngũ bội tử được thu hoạch để chiết xuất tannin. (Gall-nuts are harvested to extract tannin.)
  • Trong y học cổ truyền, ngũ bội tử có tác dụng làm se. (In traditional medicine, gall-nuts have an astringent effect.)

Advanced Usage

• The term "ngũ bội tử" is a specialized term used primarily in botanical, pharmaceutical, and traditional medicine contexts. It refers specifically to the gall-nut produced on certain sumac plants (like ) by aphids, which is a key source for Chinese gallotannin.

Variants and Related Words

• Túi ngũ bội tử: Gall bladder (in this specific botanical/pharmaceutical context, referring to the gall formation).
• Dịch chiết ngũ bội tử: Gall-nut extract.

Synonyms

• Gall: A more general English term for these types of plant growths.
• Oak apple: A specific type of gall formed on oak trees.
• Nutgall: Another common English term for gall-nut, especially in pharmacy and dyeing.

Related Terms (Contextual)

• Tannin / Tannic acid: The primary chemical compound extracted from gall-nuts.
• Astringent: A substance that contracts body tissues, a key property of gall-nut preparations in medicine.

1. (thực vật, dược) Gall-nut