noun. A silvery-white, malleable, ductile, metallic rare-earth element, with unusual magnetic properties including a Curie point at room temperature, obtained from monazite and bastnaesite and used in improving high-temperature characteristics of iron, chromium, and related alloys, and as a contrast medium for magnetic resonance imaging. Atomic number 64; atomic weight 157.25; melting point 1,313°C; boiling point approximately 3,273°C; specific gravity from 7.901; valence 3. cross-reference: Periodic Table.

noun. A supposed new element found with yttrium in gadolinite.

noun. It belongs to the same family as yttrium. Its oxid is white, and its salts are colorless: atomic weight about 156. It perhaps represents a mixture of more than a single element.

noun. A rare earth metallic element of the Lanthanide series, with a characteristic spectrum, found associated with yttrium and other rare earth elements. Symbol, Gd; it has an atomic number of 64, an atomic weight of 157.25 (C=12.011), and a valence of +3.

noun. A metallic chemical element (symbol Gd) with an atomic number of 64.

noun. a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group

"The most effective and common of these clinical agents contain a toxic metal called gadolinium, that is sequestered by wrapping the metal in organic molecules called chelates."

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