From Latin 'palus' (stake)—the same root behind 'pale,' 'impale,' and 'beyond the pale.'
A fence of wooden stakes or iron railings forming a defensive enclosure or barrier.
From French 'palissade,' from Provençal 'palissada,' from Latin 'palus' (stake, pole), from PIE *pag- (to fasten). The same Latin root gives us 'pale' (a stake), 'impale,' and the phrase 'beyond the pale'—the Pale was a fenced boundary. Key roots: *pag- (Proto-Indo-European: "to fasten, to fix").