the GNU version of the Collaborative International Dictionary of English
n. A pyramidal form of inflorescence, in which the cluster is loosely branched below and gradually simpler toward the end.
The Century Dictionary and Cyclopedia
n. A form of inflorescence produced, in its simple and normal type, when a raceme becomes irregularly compound by some of the pedicles developing into peduncles, each bearing several flowers, or branching again and again in the same order.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. compound raceme or branched cluster of flowers
Word Usage
"The flowers are arranged in a silvery, cylindrical, branching structure, called a panicle, up to 11 inches long and 1.5 inches wide."