Home

Visit Our Sites

Unabridged Dictionary

Learner's Dictionary

Word Central for Kids

Collegiate Dictionary

Premium Services

Unabridged Dictionary

Collegiate Dictionary

Encyclopedia Britannica

Institutional Subscriptions

Citing the Dictionary

Also Visit:
Unabridged
Visual

ESL:
Learner's
for Kids:
Word Central
Spell It!

thorium

Browse the Dictionary:: A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z; #

thorium

Main Entry:: tho·ri·um
Pronunciation:: \ˈthȯr-ē-əm\
Function:: noun
Etymology:: New Latin, from Old Norse Thōrr Thor
Date:: 1832

: a radioactive metallic element that is obtained especially from monazite and is usually associated with rare earths — see element table

Learn more about "thorium" and related topics at Britannica.com

See a map of "thorium" in the Visual Thesaurus

Pronunciation Symbols