actinomorphic

1 of 2

adjective

ac·​ti·​no·​mor·​phic ˌak-(ˌ)ti-nō-ˈmȯr-fik How to pronounce actinomorphic (audio)
-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 noun

actinomorphy

2 of 2

noun

ac·​ti·​no·​mor·​phy ¦ak-tə-nō-¦mȯr-fē How to pronounce actinomorphy (audio) ak-¦ti-nō- How to pronounce actinomorphy (audio)
plural -es
: the quality or state of being actinomorphic

Word History

Etymology

Adjective

German actinomorph (from actino- actino- + -morph, borrowed from Greek -morphos -morphous) + -ic entry 1

Noun

borrowed from German Actinomorphie, from actinomorph actinomorphic + -ie -y entry 2

First Known Use

Adjective

1881, in the meaning defined above

Noun

1895, in the meaning defined above

Time Traveler
The first known use of actinomorphic was in 1881

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Cite this Entry

“Actinomorphic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/actinomorphic. Accessed 21 Jun. 2026.

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