The compound adjective 'third-largest' is a modern analytical formation built entirely from native English elements. Its first element, 'third', descends from a deep Proto-Indo-European root for the number three, which evolved through Germanic into the standard ordinal. The second element, 'largest', combines the Old French-derived concept of bigness or breadth with the native Germanic superlative suffix '-est', used to mark the extreme degree. The compound's logic is purely syntactic and arithmetic, directly combining an ordinal rank with a superlative quality to denote a precise position in a sorted list based on size. This transparent construction reflects the analytical nature of Modern English, where new, precise descriptive terms are often created by combining existing words rather than borrowing or deriving from classical languages.

Structure: third + largest - third: From Old English þridda, from Proto-Germanic þridjô, from Proto-Indo-European tritiyos. Functions as a numerical root specifying position in a sequence. - largest: From the adjective large (from Old French, ultimately from Latin largus 'abundant') + the superlative suffix -est (from Old English -est, -ost). Functions as the superlative form, indicating the greatest degree of size or extent.