In zoological nomenclature, a trinomen, or trinominal name, refers to the name of a subspecies. A trinomen's a name consisting of three names: generic name, specific name and subspecific name. All three names are typeset in italics, and only the generic name's capitalised. No indicator of rank's included: in zoology, subspecies's the only rank below that of species. » Buteo jamaicensis borealis's one of the subspecies of the red-tailed hawk. (Buteo jamaicensis). If the generic and specific name… (More on Trinomen)