The term 'wind-chill' is a modern compound noun, first formally defined in the mid-20th century by polar explorers and scientists. Its first morpheme, 'wind', originates from the ancient Proto-Indo-European root h₂wéh₁n̥ts, which evolved into the pervasive force of moving air. The second element, 'chill', descends from the Proto-Germanic kaliz, conveying a state of cold. The compound's logic is transparently descriptive: it names the specific sensation and measurable effect of cold ('chill') that is induced or intensified by the presence of 'wind'. This synthesis creates a precise technical term from two foundational, concrete Germanic words to quantify a perceived environmental condition.

Structure: wind (air movement) + chill (coldness) - wind: From Old English wind, of Germanic origin; from an Indo-European root shared by Latin ventus. The functional role is a noun acting attributively to specify the cause. - chill: From Old English ciele, cele 'cold, coldness', of Germanic origin. The functional role is a noun forming the core concept of the compound.