The Spanish word 'nitrito' (meaning 'nitrite') comes from combining two elements: 'nitro' (meaning nitrate) and the chemical suffix '-ito'. The root 'nitro' can be traced back to Latin 'nitrum' (meaning nitrate), which itself comes from Ancient Greek 'νίτρον' (nitron), referring to potassium nitrate. The suffix '-ito' in Spanish chemistry terminology indicates a salt of a lower oxidation state, distinguishing nitrites from nitrates.

A simpler related Spanish word is 'nitro', which refers to nitrate compounds. While 'nitro' refers to the more oxidized nitrate compounds, 'nitrito' specifically refers to nitrite compounds which have a lower oxidation state. You might also encounter this root in words like 'nitrógeno' (nitrogen) and 'nitroglicerina' (nitroglycerin).

English speakers might recognize the relationship to words like 'nitrite', 'nitrate', and 'nitrogen', which all share the same Greek origin 'νίτρον' (nitron). The English and Spanish technical terms are very similar because they both preserve the classical roots used in scientific terminology. Compare English 'nitrite' to Spanish 'nitrito', and 'nitrate' to 'nitrato'.