mendeleev

noun

1. Dmi·tri I·va·no·vich [dmyee-tryee ee-vah-nuh-vyich] /ˈdmyi tryi iˈvɑ nə vyɪtʃ/, 1834–1907, Russian chemist: helped develop the periodic law.

1. Russian chemist who devised the Periodic Table, which shows the relationships between the chemical elements. He first published the Table in 1869 and continued to refine it over the next 20 years.