微細

1. Origins, structure, and basic meaning

• Structure: 微細 is read as びさい and is a な-adjectival noun for something minute in size or exceptionally fine in detail.
• Basic usage: Place な before the noun in 微細な毛 and 微細な模様.

2. Common pitfalls and similar expressions

• Contrast with 小さい
  • 小さい is the general word for small overall size; 微細 more formally describes an extremely small or fine scale that may be hard to observe.
• Contrast with 細かい
  • 細かい broadly covers fine detail or many small parts, while 微細 focuses on minute units or delicate features such as particles, hairs, or patterns.