Differentia

(n.) The distinguishing part or essence of a species; the characteristic attribute of a species; specific difference.

Thesaurus Entries

atmosphere, attribute, aura, badge, balm, balminess, bouquet, brand, breath, cachet, cast, character, characteristic, configuration, cut, definite odor, detectable odor, differentia, differential, distinctive feature, earmark, effluvium, emanation, essence, exhalation, feature, fetor, figure, flavor, fragrance, fragrancy, fruitiness, fume, gust, hallmark, hint, idiocrasy, idiosyncrasy, impress, impression, incense, index, individualism, keynote, lineaments, mannerism, mark, marking, mephitis, mold, muskiness, nature, nosegay, odor, particularity, peculiarity, perfume, property, quality, quirk, redolence, reek, savor, scent, seal, shape, singularity, smack, smell, specialty, spice, spiciness, spoor, stamp, stench, stink, subtle odor, suggestion, sweet savor, sweet smell, taint, tang, taste, token, trace, trail, trait, trick, whiff