'Tailboard' definitions:

Definition of 'tailboard'

From: WordNet
noun
A gate at the rear of a vehicle; can be lowered for loading [syn: tailgate, tailboard]

Definition of 'Tailboard'

From: GCIDE
  • Tailboard \Tail"board`\, n. The board at the rear end of a cart or wagon, which can be removed or let down, for convenience in loading or unloading. [1913 Webster]