actinoid

[ak-tuh-noid]

ac·ti·noid

[ak-tuh-noid]
adjective
raylike; radiate.

Origin:
1840–50; actin- + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actinoid is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
actinoid (ˈæktɪˌnɔɪd)
 
adj
having a radiate form, as a sea anemone or starfish

Collins English Dictionary - Complete & Unabridged 10th Edition
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