1.
Anything believed to provide protection or safety; safeguard.
2.
A statue of Athena, especially one on the citadel of Troy on which the safety of the city was supposed to depend.
3.
A rare metallic element of the platinum group, silver-white, ductile and malleable, harder and fusing more readily than platinum; used chiefly as a catalyst and in dental and other alloys. Symbol: Pd; atomic weight: 106.4; atomic number: 46; specific gravity: 12 at 20°C.
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