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Adjacent Words

actini-
Actinia
Actiniae
actinian
Actiniaria
actiniarian
Actinias
actinic
actinic balance
actinic dermatitis
actinic keratosis
actinic radiation
actinic ray
actinically
actinide series
Actinidia
Actinidia arguta
Actinidia chinensis
Actinidia deliciosa
Actinidia polygama
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Actiniopteris
actinism
actinium
actino-

actinide definitions

WordNet (r) 3.0 (2005)

n
1: any of a series of radioactive elements with atomic numbers 89 through 103 [syn: actinoid, actinide, actinon]

Merriam Webster's

noun Etymology: International Scientific Vocabulary Date: 1945 any of the series of elements with increasing atomic numbers that begins with actinium or thorium and ends with lawrencium see periodic table table

Oxford Reference Dictionary

n. (also actinoid) Chem. any of the series of 15 radioactive elements having increasing atomic numbers from actinium to lawrencium. Phrases and idioms: actinide series this series of elements. Etymology: ACTINIUM + -IDE as in lanthanide



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