pollution-free

The compound adjective "pollution-free" is a modern formation that logically combines two established English words to create a transparent, descriptive meaning. The first element, "pollution," traces back to the Latin verb polluere, meaning 'to soil or defile,' which itself may derive from the Proto-Indo-European root pel- ('dust, flour'), conceptually linking to the idea of making something impure with filth. The second element, "free," originates from the Old English frēo, related to the Proto-Germanic frijaz and the PIE root priH-ós ('dear, beloved'), which evolved to signify liberty and absence. When combined, the term literally means 'without defilement,' directly and logically describing a state or object exempt from environmental contamination.

Structure: pollution (contamination) + free (without) - pollution: From Latin pollutionem (noun of action from polluere meaning 'to soil, defile'), functioning as the base noun denoting the undesirable substance or state. - free: From Old English frēo ('exempt from, not in bondage'), functioning as a combining form meaning 'without' or 'lacking'.