The compound adjective 'two-pound' is a straightforward combination of the numeral 'two' and the noun 'pound'. 'Two' originates from the Proto-Indo-European root duwo-, a fundamental numeral that gave rise to equivalents across many languages, including Latin 'duo' and Greek 'duo'. 'Pound' derives from the Latin phrase 'libra pondo', meaning 'a pound by weight', with 'pondo' (ablative of 'pondus' meaning 'weight') entering Germanic via early trade. The compound logically fuses quantity and unit, creating a term that specifies either a precise weight or a monetary amount in the British system, demonstrating the transparent and productive nature of English compounding.

Structure: two (numeral) + pound (unit) - two: From Old English 'twā', of Germanic origin; related to Dutch 'twee' and German 'zwei', from an Indo-European root shared by Latin 'duo' and Greek 'duo'. Functions as a numeral quantifier. - pound: From Old English 'pund', of Germanic origin; from Latin 'pondo' meaning 'by weight'. Functions as a noun denoting a unit of weight or currency.