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Actaeon
ACTH
actin
actin-
actinal
acting
actinian
actinic
actinide
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actinide
ac·tin·ide [ áktə nd ] (plural ac·tin·ides)


noun 
Definition:
 
radioactive element: an element in the series of radioactive elements beginning with actinium and ending with lawrencium
[Mid-20th century. <actinium, after lanthanide]
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