Meaning

noun pen where racehorses are saddled and paraded before a race

originThe noun is almost certainly a variant of dialectal British parrock (“enclosure; park; croft, small field, paddock”), from Middle English parrok, parrock (“enclosed pasture, paddock; coop; feeding stall; cabin, hut”) [and other forms], from Old English pearroc, pearruc (“fence used to enclose a space; area enclosed by such a fence, enclosure”), from Proto-West Germanic *parruk (“enclosure; pen…

Etymology from Wiktionary, CC BY-SA 3.0