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1. Seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion
   - underseal
    
2. The first or preliminary coat of paint or size applied to a surface
   - flat coat, ground, primer, priming, primer coat, priming coat
    
3. Thick soft fur lying beneath the longer and coarser guard hair
   - underfur

1. Cover with a primer; apply a primer to
   - prime, ground

Derived forms: undercoated, undercoating, undercoats

Type of: coat of paint, fur, paint, seal

Encyclopedia: Undercoat