\Um"bel\, n. [L. umbella a little shadow, umbrella, dim.
of umbra shade. See {Umbrella}.] (Bot.)
A kind of flower cluster in which the flower stalks radiate
from a common point, as in the carrot and milkweed. It is
simple or compound; in the latter case, each peduncle bears
another little umbel, called umbellet, or umbellule.