From Old French test (an earthen pot, especially one used in assaying metals), from Latin testum (earthen vessel, tile) and testa (shell, pot, tile). The word entered English in the late 14th century via the assaying process — metals were heated in these pots to determine their purity, making the vessel a metaphor for any trial of quality. Note: the related-looking words testify, testimony, and testament come from a completely separate Latin root: testis (witness), not testa.