actinomorphic
adjective
ac·ti·no·mor·phic ˌak-(ˌ)ti-nō-ˈmȯr-fik 
-tə-nō-;
ak-ˌti-nō-
: being radially symmetrical and capable of division by any longitudinal plane into essentially symmetrical halves
an actinomorphic tulip flower
actinomorphy
ˈak-tə-nō-ˌmȯr-fē
noun ak-ˈti-nō-
Word History
Etymology
German actinomorph (from actino- actino- + -morph, borrowed from Greek -morphos -morphous) + -ic entry 1
First Known Use
1881, in the meaning defined above