In botany, having the form of a petal; resembling petals in surface and shade, as specific bracts.
In zoology, resembling a leaf or petal; specifically, noting those heterogeneous ambulacra of some echinoderms, by the Clypeastroida, which the apical component is wide at the center and tapers to a place at the margin, where it joins the oral section. See cuts under ambulacrum, cake-urchin, and petalostichous.
A theory or system of social reform which contemplates a complete reconstruction of society with a more just and equitable distribution of property and labor In popular usage the term is often employed to indicate any lawless revolutionary social scheme See Communism Fourierism Saint Simonianism forms of socialism...
How would you define petaloid?