The compound adjective 'two-legged' is a transparent and logical construction from native English elements. The numeral 'two' has a stable history from its Proto-Indo-European root dwóh₁, entering English via its Germanic lineage. The noun 'leg', borrowed from Old Norse into Middle English, replaced the native Old English term 'sceanca'. The suffix '-ed', used to form participial adjectives, was appended to nouns in Old English to create descriptors meaning 'possessing' or 'provided with'. Therefore, the literal morphemic sequence 'two' + 'leg' + 'having' directly and clearly yields the modern meaning 'having two legs', a pattern common in English for describing physical attributes.

Structure: two (numeral) + leg (noun) + ed (adjective-forming suffix) - 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 root. - leg: From Middle English, from Old Norse 'leggr', of Germanic origin. Functions as a noun root denoting a limb. - ed: A suffix forming adjectives from nouns, indicating 'having' or 'characterized by'. From Old English '-ede', '-ode', '-ad'.