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1. WordNet® 3.0 (2006)
    n 1: a rare soft silvery metallic element; occurs in small
         quantities in sphalerite [syn: indium, In, atomic
         number 49]

2. The Collaborative International Dictionary of English v.0.48
Indium \In"di*um\, n. [NL. See Indigo.] (Chem.)
   A rare metallic element, of atomic number 49, discovered in
   certain ores of zinc, by means of its characteristic spectrum
   of two indigo blue lines; hence, its name. In appearance it
   resembles zinc, being white or lead gray, soft, malleable and
   easily fusible, but in its chemical relation it resembles
   aluminium or gallium (valence +3). Symbol In. Atomic weight,
   [1913 Webster +PJC]

3. The Elements (07Nov00)
Symbol: In
Atomic number: 49
Atomic weight: 114.82
Soft silvery element belonging to group 13 of the periodic table. The
common natural isotope is In-115, which has a half-life of 6*10^4 years.
Five other radioisotopes exist. Discovered in 1863 by Reich and Richter.

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