The term 'stock-option' is a modern financial compound, fusing two words with deep historical roots. 'Stock' originates from the Old English concept of a tree trunk or post, which by the 14th century had metaphorically extended to mean the capital or fund of a trading enterprise, akin to the solid trunk from which wealth grows. 'Option' descends from the Latin optio, meaning choice or free will, itself derived from the verb optare (to choose, desire). The compound's logic is transparent: it literally denotes a 'choice concerning stock,' a contractual right allowing the holder to choose whether to buy or sell shares at a set price, thus blending the concrete asset ('stock') with the abstract power of selection ('option').

Structure: stock (financial share) + option (right to choose) stock: From Old English stocc (tree trunk, post, log). In this compound, it functions as a noun meaning a share in the capital of a company. option: From Latin optio (choice, free will), from optare (to choose, desire). In this compound, it functions as a noun meaning a right to choose.