blood-borne

The compound adjective 'blood-borne' is a modern scientific term formed by combining two native English elements. The first element, 'blood', retains its ancient Germanic sense of the vital fluid circulating in the body. The second element, 'borne', derives from the past participle of 'to bear', a verb with deep Proto-Indo-European roots meaning to carry or bring. The term's logic is transparently literal: it describes a pathogen or agent that is carried within the bloodstream. This direct compounding reflects a pattern in Modern English for creating precise technical terminology from existing, familiar words.

Structure: blood (fluid) + borne (carried) 'blood' originates from Old English 'blōd', of Germanic origin. 'Borne' is the past participle of the verb 'bear' (to carry), from Old English 'beran', of Germanic origin.