The compound adjective "two-foot-tall" is a modern English formation built from three native elements. "Two" and "foot" are ancient, stable words from Proto-Germanic, ultimately tracing back to the Proto-Indo-European roots dwo- (two) and ped- (foot). "Tall" entered English with a different meaning and its path to signifying height is less clear, but it became the standard adjective for vertical measurement. The compound logically and transparently combines a numerical quantity, a standard unit of measure, and a dimension attribute to create a specific descriptive term, exemplifying English's analytical approach to creating precise modifiers.

Structure: two (number) + foot (unit) + tall (height) - 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 cardinal number. - foot: From Old English fōt, of Germanic origin; related to Dutch voet and German Fuss, from an Indo-European root shared by Latin pes, ped-. Functions as a noun denoting a unit of linear measure. - tall: From Middle English tal, probably from Old English getæl ‘swift, prompt’. The sense development is obscure; the modern meaning emerged in the late 16th century. Functions as an adjective describing great height.