neodymium
(ˌni oʊˈdɪm i əm)
Random House Webster's College Dictionary
a rare-earth metallic trivalent element occurring with cerium and other rare-earth metals, and having rose-colored salts.
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lanthanum
(lanthanum, La, atomic number 57)
Princeton's WordNet
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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atomic number 57
(lanthanum, La, atomic number 57)
Princeton's WordNet
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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la
(lanthanum, La, atomic number 57)
Princeton's WordNet
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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lanthanum
Webster Dictionary
a rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La
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terbium
Webster Dictionary
a rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150
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lutetium
(ˈti ʃi əm)
Random House Webster's College Dictionary
a trivalent rare-earth element.
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gadolinium
(ˌgæd lˈɪn i əm)
Random House Webster's College Dictionary
a rare-earth metallic element.
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erbium
(ˈɜr bi əm)
Random House Webster's College Dictionary
a rare-earth element, having pink salts.
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promethium
(əˈmi θi əm)
Random House Webster's College Dictionary
a rare-earth, metallic, trivalent element.
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rare earth
(ˈrɛər bɪt)
Random House Webster's College Dictionary
the oxide of any of the rare-earth elements contained in various minerals.
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samarium
(əˈmɛər i əm)
Random House Webster's College Dictionary
a rare-earth metallic element discovered in samarskite.
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holmium
(ˈhoʊl mi əm)
Random House Webster's College Dictionary
a rare-earth, trivalent element found in gadolinite.
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europium
(ʊˈroʊ pi əm, yə-)
Random House Webster's College Dictionary
a rare-earth metallic element whose salts are light pink.
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lanthanide
(ˈlæn θəˌnaɪd, -nɪd)
Random House Webster's College Dictionary
any element of a series of rare-earth elements of atomic numbers 57 through 71.
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thulium
(ˈθu li əm)
Random House Webster's College Dictionary
a rare-earth metallic element found in gadolinite and other uncommon minerals.
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praseodymium
(ˌpreɪ zi oʊˈdɪm i əm, ˌpreɪ si-)
Random House Webster's College Dictionary
a rare-earth metallic trivalent element, named from its green salts.
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lanthanide series
(ˈlæn θəˌnaɪd, -nɪd)
Random House Webster's College Dictionary
the series of rare-earth elements of atomic numbers 57 through 71 (lanthanum through lutetium).
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terbium
(ˈtɜr bi əm)
Random House Webster's College Dictionary
a rare-earth, metallic element present in certain minerals and yielding colorless salts.
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gadolinite
(ˈgæd l əˌnaɪt)
Random House Webster's College Dictionary
a silicate mineral from which the rare-earth metals gadolinium, holmium, and rhenium are extracted.
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cerium
(ˈsɪər i əm)
Random House Webster's College Dictionary
a steel-gray, ductile metallic element of the rare-earth group found only in combination.
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dysprosium
(ɪsˈproʊ si əm, -ʃi-)
Random House Webster's College Dictionary
a rare-earth element that is highly reactive and paramagnetic and used to absorb neutrons in nuclear reactors.
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lanthanum
(ˈlæn θə nəm)
Random House Webster's College Dictionary
a rare-earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite.
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helium
Webster Dictionary
a gaseous element found in the atmospheres of the sun and earth and in some rare minerals
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eu
(europium, Eu, atomic number 63)
Princeton's WordNet
a bivalent and trivalent metallic element of the rare earth group
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bastnasite
(bastnasite, bastnaesite)
Princeton's WordNet
a yellow-to-brown mineral that is a source of rare earth elements
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bastnaesite
(bastnasite, bastnaesite)
Princeton's WordNet
a yellow-to-brown mineral that is a source of rare earth elements
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europium
(europium, Eu, atomic number 63)
Princeton's WordNet
a bivalent and trivalent metallic element of the rare earth group
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misch metal
(misch metal)
Princeton's WordNet
a pyrophoric alloy made from a mixture of rare-earth metals
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atomic number 63
(europium, Eu, atomic number 63)
Princeton's WordNet
a bivalent and trivalent metallic element of the rare earth group
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