The Spanish word 'calor' (meaning 'heat') comes directly from the Latin word 'calor' with the same meaning. The Latin 'calor' was formed from two parts: the verb 'calere' meaning 'to be warm' and the suffix '-or' which was used to form nouns indicating an effect or result. So literally, 'calor' represented the result or effect of being warm - heat itself.

Several common Spanish words share this root, including: 'cálido' (warm), 'caliente' (hot), 'calentar' (to heat up), and 'calefacción' (heating). All these words carry the basic meaning of warmth or heat from the same Latin origin.

English has borrowed several words from the same Latin root, including 'calorie' (unit of heat), 'cauldron' (a large pot for heating), 'scald' (to burn with hot liquid), and 'calescent' (growing warm). The scientific term 'caloric', referring to heat, also comes from this root. These words all preserve the connection to heat or warming that was present in the original Latin.