Definify.com
Webster 1913 Edition
Umbel
Um′bel
,Noun.
(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.
Webster 1828 Edition
Umbel
UM'BEL
,Noun.
In botany, a particular mode of inflorescence or flowering, which consists of a number of flower-stalks or rays, nearly equal in length, spreading from a common center, their summits forming a level, convex, or even globose surface, more rarely a concave one, as in the carrot. it is simple or compound; in the latter, each peduncle bears another little umbel, umbellet or umbellicle.
Umbel is sometimes called a rundle, from its roundness.