un·der·coat /-ˌkot/
 短毛,絨毛,內層油漆
 Un·der·coat n.
 1. A coat worn under another; a light coat, as distinguished from an overcoat, or a greatcoat.
 2. A growth of short hair or fur partially concealed by a longer growth; as, a dog's undercoat.
 ◄ ►
 undercoat
      n 1: seal consisting of a coating of a tar or rubberlike material
           on the underside of a motor vehicle to retard corrosion
           [syn: underseal]
      2: the first or preliminary coat of paint or size applied to a
         surface [syn: flat coat, ground, primer, priming,
         primer coat, priming coat]
      3: thick soft fur lying beneath the longer and coarser guard
         hair [syn: underfur]
      v : cover with a primer; apply a primer to [syn: prime, ground]