barracoon

noun

1. A temporary cage for holding (originally) black slaves, and later convicts and other types of prisoners.

   “Beyond Cape Palmas, the coast line is a beach of bright white sand, from which the slave barracoons have now disappeared […].”

   “He was now a prisoner, and—thrust into a suffocating barracoon, herded with the foulest of mankind, with all imaginable depths of blasphemy and indecency sounded hourly in his sight and hearing—he lost his self-respect, and became what the jailers took him to be […].”