the word 'whalebone' is a transparent compound formed from two old english roots, 'hwæl' and 'bān'. it is a classic example of a descriptive kenning, where two familiar nouns are combined to name a specific material derived from a whale. the term originally referred literally to the bone of a whale, but its meaning narrowed to specifically denote the keratinous baleen plates from the mouths of certain whale species, which were commercially valuable. this semantic shift from general 'bone' to a specific 'baleen' highlights how practical use and trade can refine a compound word's meaning.

Structure: whale + bone whale (from old english 'hwæl', meaning a large sea fish) + bone (from old english 'bān', meaning the hard material forming the skeleton)