Actinomorph

The flower of the herb of San Roberto (Geranium robertianum) has radial symmetry.

In botany, the term actinomorphic means having radial symmetry. They are synonyms of this word —in addition to radial—: regular, polysymmetric or multilateral. It opposes the term zygomorph, which is used to designate structural (usually flowers) of bilateral symmetry.

Etymology

Voice composed of the Greek words ἀκτίς 'ray of light' and μορφή 'shape'.