n. A shadow or shade.n. Among the Romans, one who went to a feast merely at the solicitation of one invited: so called because he followed the guest as a shadow.n. In algebra, a symbol which, when paired with another, makes the symbol of a quantity. See umbral notation, under umbral.n. The only genus of Umbridæ; the mud-minnows. See minnow. 2 , and Umbridæ. There are two species, respectively of Europe and North America, U. krameri and U. limi.n. [lowercase] A sciænoid fish, Umbrina cirrosa; the umbrine. See cut under Umbrina.