actinia
noun
ac·tin·ia
ak-ˈti-nē-ə
1
capitalized in some classifications : a genus of sea anemones nearly coextensive with the order Actiniaria
2
plural actiniae
ak-ˈti-nē-ˌē
or actinias : any sea anemone or related animal 
Word History
Etymology
borrowed from New Latin, from Greek aktīn-, aktís "ray, beam" + New Latin -ia -ia entry 1
First Known Use
1752, in the meaning defined at sense 1
- at the polls
- at the present time
- at the pump
- at the pumps
- at the ready
- at the receiving end
- at the risk of
- at the risk of (doing something)
- at the risk of doing something
- at the root of
- at the same time
- at the seams
- at the sight of
- at the stroke of
- at the tender age
- at the threshold
- at the time of
- at the time of (something)
- at the time of something
- at the top of one's class
- at the top of one's form
- at the top of one's game
- at the top of one's lungs
- at the top of one's voice
- at the top of one's/the class