four-member

The compound adjective 'four-member' is a transparent and relatively modern formation in English, combining two ancient roots. The numeral 'four' descends from the Proto-Indo-European root kʷetwóres, which gave rise to the number across many Indo-European languages, signifying a fundamental quantity. The word 'member' traces back to Latin membrum, meaning a limb or a distinct part of a whole body, which metaphorically extended to mean an individual belonging to a group. The logic of the compound is purely descriptive, directly applying the quantifying numeral to the unit-denoting noun to specify a group composed of exactly four constituent parts or individuals.

Structure: four (number) + member (constituent part) - four: From Old English fēower, of Proto-Germanic origin; related to Dutch vier and German vier, from an Indo-European root shared by Latin quattuor and Greek tessares. Functions as a numerical quantifier. - member: From Old French membre, from Latin membrum 'limb, part of the body'. Functions as a noun denoting a constituent part of a group or body.