The Spanish word 'secador' (meaning 'dryer') comes from combining the verb 'secar' ('to dry') with the agent suffix '-dor'. The verb 'secar' itself derives from the Latin verb 'siccare' ('to dry'), which in turn comes from the Latin adjective 'siccus' ('dry'). The suffix '-dor' is added to verbs to create nouns that refer to the person or thing that performs the action - in this case, something that dries.

Some simpler related Spanish words include the verb 'secar' (to dry) and the adjective 'seco/seca' (dry). These words share the same Latin root 'siccus' and are commonly used in everyday Spanish. For example, while 'secador' specifically refers to a dryer (like a hair dryer), 'secar' is the basic action of drying anything, and 'seco' describes the state of being dry.

While not immediately obvious, the English word 'siccative' (a substance that promotes drying, especially in paint or varnish) comes from the same Latin root 'siccus'. This technical term is mainly used in art and industrial contexts. The English word 'desiccate' (to remove moisture and dry thoroughly) also comes from this Latin root, as does 'desiccant' (a substance used for drying).