The Spanish word 'granero' (meaning 'granary') comes from the Latin word 'granarium', which had the same meaning. The Latin 'granarium' was formed by combining two parts: 'granum' meaning 'grain' or 'seed', and the suffix '-arium' which was used to indicate a place where something is stored or kept. So literally, a 'granarium' was a place for storing grain, which is exactly what a granary is used for.

Several common Spanish words share the same Latin root 'granum'. The most basic is 'grano', which directly means 'grain' or 'seed'. You might also recognize 'granada' (pomegranate), which got its name because it's full of seeds, and 'granito' (granite), which was named for its grainy appearance.

Many English words are related to 'granero' through the Latin root 'granum'. The most obvious is 'granary' itself, which means the same thing. Other related words include 'grain', 'granule', 'granite', and 'pomegranate'. The word 'garner' (meaning to gather or collect) also comes from the same Latin root. Even the word 'grenade' is related, as early grenades resembled pomegranates in shape!