微量

1. Origins, structure, and basic meaning

• Structure: 微量 (びりょう) is a very small quantity. It appears as a noun modifier and adverbial amount.
• Basic usage: A sample contains trace iron; a minute amount of flavoring adjusts aroma.

2. Common pitfalls and similar expressions

• Trace content detected and minute dose added
  • 微量の鉄分 is contained matter; ごく微量加える is an input amount. Exact thresholds vary by field.