mandarinquat
n.— «Mandarinquat is the clunky if accurate name coined for this small citrus hybrid, a cross between a mandarin orange and a kumquat. It is similar to calamansi, an ancient Asian cross between the two fruits that is rounder and often green, and tastes pretty much the same.» —“A New Citrus Finds Its Way to the Table” by Florence Fabricant New York Times Jan. 12, 2005. (source: Double-Tongued Dictionary)