The word 'winnowing' originates from the Old English verb windwian, which is derived from the Proto-Germanic root windwōną, meaning 'to fan' or 'to blow'. This root is transparently connected to the word 'wind', reflecting the core action of using wind or a forced air current to separate lighter chaff from heavier grain. The addition of the '-ing' suffix, a common Germanic participial and nominalizing element, creates a word that denotes either the ongoing action or the process itself. Thus, the modern term retains its literal agricultural meaning while also being readily applied in figurative contexts to describe the analytical process of separating valuable elements from irrelevant ones.

Structure: winnow (to separate chaff) + ing (noun/verb suffix) winnow (from Old English windwian, meaning 'to fan, winnow', related to wind); ing (from Old English -ung, -ing, a suffix forming verbal nouns or present participles).