illness · rapid

1. Origins, structure, and basic meaning

• Structure: 疾 has 10 strokes and appears in words for illness and rapid movement.
• Basic usage: 疾患 is read しっかん, and 疾走 is read しっそう.

2. Common pitfalls and similar expressions

• Illness and rapid movement
  • In 疾患 and 疾走, the reading of 疾 takes the form しっ.
  • 架空の疾患 means a fictional disease.
  • 全力で疾走する means to sprint at full speed. Here, 疾 concerns rapid movement.