- Jus·tus [yoo s-too s] /ˈyʊs tʊs/, Baron von [fuh n] /fən/, 1803–73, German chemist.
- Justus (ˈjʊstʊs), Baron von Liebig. 1803–73, German chemist, who founded agricultural chemistry. He also contributed to organic chemistry, esp to the concept of radicals, and discovered chloroform
- German chemist who was one of the first to investigate organic compounds and to develop techniques for their analysis. Liebig also first described the process now known as photosynthesis, and he made observations about the use of fertilizers that led to many improvements in agricultural practices.