second-oldest

The compound adjective "second-oldest" is a transparent English formation built from two native elements. "Second" originates from the Latin secundus, meaning "following" or "next," derived from the verb sequi (to follow), which entered English via French. "Oldest" is the superlative form of the Old English adjective eald, meaning "aged" or "ancient," combined with the Germanic superlative suffix -est. The compound logically combines the concept of numerical sequence ("second") with the superlative degree of age ("oldest") to precisely denote the entity that is the next in age after the single oldest one. This analytical construction exemplifies English's tendency to create clear, compound modifiers for specific comparative rankings.

Structure: second (following first) + oldest (superlative of old) - second: From Latin secundus (following, next), from sequi (to follow). Functions as a numeral/ordinal adjective. - oldest: From Old English eald (old) + superlative suffix -est. Functions as a superlative adjective.