1.
fever, temperature
An abnormally high body temperature, usually indicating illness.
2.
heat, thermal energy
Warmth or high temperature of physical objects.
3.
enthusiasm, passion
Intense interest or excitement about something.
熱 can refer to body temperature, physical heat, or emotional passion.
MEDICAL USAGE:
- 熱がある: to have a fever
- 熱が出る: to develop a fever
- 熱が下がる: fever goes down
- 熱を測る: to take temperature
- 高熱: high fever
- 微熱: slight fever
OTHER MEANINGS:
- 熱エネルギー: thermal energy
- 熱中する: to be absorbed in
- 情熱: passion