Babbitt metal : A soft white alloy of variable composition (as a nine parts of tin to one of copper, or of fifty parts of tin to five of antimony and one of copper) used in bearings to diminish friction.

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Taxonomy
Babbitt metal, white metal, pillow block, shaft, Babbitt, tin, copper, Babbitt bearings, bearings, free encyclopedia, plain bearing, high spots, metal, steel shell, lubricant, hole, lubrication, capability.

Defination from the web:
Babbitt metal is soft and easily damaged, and seems at first sight an unlikely candidate for a bearing surface, but this appearance is deceptive. ... the steel shell is plated with a coating of bronze which is in turn coated with a thin layer of Babbitt metal as the bearing surface. ...