Definition

1. Noun:
   • Poliosis: A medical condition characterized by the localized or widespread loss of pigment in hair, resulting in white or gray patches. This term is specific and technical.

Usage Examples

• Noun:
  • Bệnh nhân được chẩn đoán mắc chứng bạc lông từ nhỏ. (The patient was diagnosed with poliosis from a young age.)
  • Một mảng tóc bạc lông trên đầu cô ấy rất dễ nhận thấy. (A patch of poliosis on her head is very noticeable.)

Advanced Usage

• "bạc lông bẩm sinh": congenital poliosis.
  • Đó là một trường hợp bạc lông bẩm sinh hiếm gặp. (That is a rare case of congenital poliosis.)

Variants and Related Words

• Bạc tóc / Tóc bạc (n): Gray hair (general term for hair turning gray due to age or other factors, not the specific medical condition).
  • Ông ấy bắt đầu có tóc bạc khi mới ngoài ba mươi. (He started getting gray hair just after turning thirty.)

Synonyms

• Poliosis (n): The direct English medical term.
• Tóc bạc thành mảng (n): Descriptive phrase meaning "hair turning white in patches."

Notes on Meaning

• Important Distinction: In Vietnamese, 'bạc lông' is a specific medical term. The more common word 'bạc' alone means "silver" or, when referring to hair, "gray/white." 'Bạc lông' refers precisely to the condition of patchy white hair, often present from birth or associated with certain syndromes, unlike general graying with age.