quintessence

n. 1 (usu. Foll. By of) purest and most perfect form, manifestation, or embodiment of a quality etc. 2 highly refined extract.  quintessential adj. Quintessentially adv. [latin quinta essentia fifth substance (underlying the four elements)]

n. The fifth or last and highest essence or power in a natural body. See Ferment oils, under Ferment.