Pronunciation: (ak-tin"ō-môr'fik, ak"tu-nō-), [key]
1. Biol.having radial symmetry.
2. Bot.(of certain flowers, as the buttercup) divisible vertically into similar halves by each of a number of planes passing through the axis. Also,ac•tin"o•mor'phous.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.