four-pound

The compound "four-pound" is a transparent combination of the numeral "four" and the unit "pound." The word "four" has a remarkably stable lineage, tracing back to the Proto-Indo-European root kʷetwóres, which evolved through Germanic into Old English fēower. "Pound" entered English via the Germanic languages, but its ultimate source is Latin pondus, meaning "weight," reflecting its original function as a measure of mass. The logic of the compound is purely descriptive, directly stating a quantity (four) of a specified unit (pound), used primarily as an attributive adjective to modify nouns like "hammer," "note," or "turkey."

Structure: four (number) + pound (unit) - four: From Old English fēower, from Proto-Germanic fedwōr, from Proto-Indo-European kʷetwóres. Functions as a numerical quantifier. - pound: From Old English pund (a unit of weight, also a monetary unit), from Proto-Germanic pundą, from Latin pondō ("by weight"), from pondus ("weight"). Functions as the unit being quantified.