The Spanish word 'contaminado' (meaning 'contaminated') comes from the Latin word 'contaminare', which meant 'to defile or pollute'. The Latin word itself was formed by combining two elements: the prefix 'con-' (meaning 'with' or 'together') and 'taminare' (meaning 'to touch or defile'). The Spanish verb 'contaminar' developed directly from Latin 'contaminare', and 'contaminado' is its past participle form, created by adding the suffix '-ado'.

This etymology shows how the idea of 'touching together' or 'bringing into contact' evolved into the concept of contamination or pollution, as unwanted substances come into contact with and affect something else.

Some simpler related Spanish words include 'contaminar' (the verb 'to contaminate') and other forms like 'contaminante' (contaminating/polluting). These all share the same Latin root and follow a similar pattern of meaning related to pollution or contamination.

English speakers can easily relate this word to English 'contaminate' and 'contaminated', which come from the same Latin source 'contaminare'. The English and Spanish words maintain very similar meanings and spellings, making it easier to remember. The prefix 'con-' is also found in many English words like 'connect', 'combine', and 'contact', all carrying the sense of 'with' or 'together'.