noun A·na·to·li Ar·ka·dye·vich [an-uh-toh-lee; Russian uh-nuh-taw-lyee uhr-kah-dyi-vyich] /ˈæn əˌtoʊ li; Russian ʌ nʌˈtɔ lyi ʌrˈkɑ dyɪ vyɪtʃ/, 1894–1975, Russian scientist.