Definition of "yett"

They rode into the outer courtyard, through the muckle faulding yetts and aneath the auld portcullis; […]

1824, Sir Walter Scott, Redgauntlet

The outer yett was closed, and a torch burned in a socket set in the gatehouse wall beside the archway. A guard stepped up, peered through the yett at Guillaume, and nodded to someone off to the side.

2015, Douglas Nicholas, Throne of Darkness, page 126

So when the L. Chauncellor or Keeper passeth anie patent by imediate warrant, yett the fees of the Clerke of the Seale and Signett are ordered to be awnswered, and yett theie doe noething for them.

1608, “Kalenders of the Starre Chamber, extract republished 1840, J. Payne Collier (editor), Lord Bacon and the Star Chamber”, in The Egerton papers: A collection of public and private documents, chiefly illustrative of the times of Elizabeth and James I, from the original documents, page 431