From The Collaborative International Dictionary of English v.0.48:

Undercoat \Un"der*coat`\, n.
   1. A coat worn under another; a light coat, as distinguished
      from an overcoat, or a greatcoat.
      [1913 Webster]

   2. A growth of short hair or fur partially concealed by a
      longer growth; as, a dog's undercoat.
      [1913 Webster]
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