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: A Aë A- A. Aa Ab Ac Ad Ae Af Ag Ah Ai Aj Ak Al Am An Ao Ap Aq Ar As At Au Av Aw Ax Ay Az

Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

actinium

POS

Noun

HYPHEN

ac=tin=i=um

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WORDNET DICTIONARY

Noun actinium has 1 sense

actinium(n = noun.substance) ac, atomic number 89 - a radioactive element of the actinide series; found in uranium ores; Array

is a kind of chemical element, element

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CIDE DICTIONARY

actinium, n. [Gr. , , ray.].

A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light. [1913 Webster]

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OXFORD DICTIONARY

actinium, n. Chem. a radioactive metallic element of the actinide series, occurring naturally in pitchblende.

Usage

Symb.: Ac.

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