The earliest English references to evergreen conifers appear in Old English glossaries where the native term *fyren* denoted ‘wood of fire’. As Norse traders arrived in the British Isles during the 9th‑10th centuries, their word *fura* entered the lexicon, eventually simplifying to *fir*. This transition mirrors broader linguistic borrowing patterns, where the influx of Norse vocabulary reshaped everyday speech and botanical naming alike.
During the High Middle Ages, monks cataloguing forest resources for timber and resin began to standardise the term in written Latin‑English glosses. The 12th‑century *Tractatus de Viridi* explicitly lists *fir* alongside *pine* and *spruce* as the three principal evergreen trees, a classification that would guide timber law, herbal medicine, and the emerging symbolism of perpetual life in religious art.