'selenium-rich' originates from the element 'selenium', which is named after the Greek word 'selene', meaning 'moon', combined with the English word 'rich', indicating abundance.

The term 'selenium-rich' evolved from the combination of 'selenium', discovered in 1817, and the word 'rich', used in English since the 12th century.

Initially, 'selenium-rich' simply described the presence of selenium, but it now often implies health benefits associated with selenium content.