shigella

The word 'shigella' is a modern Latin eponym, coined in the early 20th century to honor the Japanese physician Kiyoshi Shiga, who first isolated the bacterium in 1897. The suffix '-ella' is a diminutive suffix in Latin, often used in microbiology to form genus names of bacteria (e.g., Salmonella, named after Daniel E. Salmon). Therefore, the name literally means "little Shiga," a taxonomic tribute to its discoverer. The semantic logic is purely commemorative, linking the pathogen directly to the scientist who identified it, rather than deriving from descriptive ancient roots.

This is a modern scientific Latin formation, not composed of separable English morphemes. It is an eponym, a word created from a person's name.