Definition

1. Noun:
   • Main root: The primary, central, and usually largest root of a plant, from which smaller lateral roots may grow. It is the first root to develop from a seed and typically grows downward into the soil.

Usage Examples

• Noun:
  • Cây sồi non có một rễ cái rất dài và khỏe. (The young oak tree has a very long and strong main root.)
  • Khi trồng cây, cần cẩn thận để không làm đứt rễ cái. (When transplanting a tree, one must be careful not to break the main root.)
  • Rễ cái của cà rốt mà chúng ta ăn thực ra là một loại rễ củ. (The main root of the carrot that we eat is actually a type of taproot.)

Advanced Usage

• Botanical Context: In botany, 'rễ cái' specifically refers to the taproot, a type of root system characterized by one dominant, thick root. This contrasts with fibrous root systems.
  • Cây đậu có hệ rễ cọc, với một rễ cái phát triển mạnh. (The bean plant has a taproot system, with a well-developed main root.)

Variants and Related Words

• Rễ (root): The general term for all types of plant roots.
• Rễ phụ / rễ bên (lateral root/secondary root): Smaller roots that branch out from the main root.
• Rễ củ (taproot/tuberous root): A thickened main root that stores nutrients, like in carrots or radishes. This is a specific type of 'rễ cái'.
• Rễ cọc (taproot system): The root system dominated by a single main root.

Synonyms

• Rễ chính (primary/principal root): A direct synonym emphasizing its primary role.
• Rễ trục (axial root): A more technical synonym.

Related Phrases/Idioms

• (Không có thành ngữ phổ biến trực tiếp sử dụng "rễ cái"): There are no common idioms directly using "rễ cái". The word is primarily used in literal, botanical, and agricultural contexts.

1. (thực vật) Main root