ac·tin·i·an (ăk-tĭnē-ən) also ac·tin·i·a (-ə)
n. pl. ac·tin·i·ans also ac·tin·i·ae (-ē-ē′)
A sea anemone.
[New Latin Actīnia, genus name, from Greek aktīs, aktīn-, ray; see ACTINO-.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.