Seneschal — A steward or major-domo.
Siller — Silver.
Sirrah — Mister; fellow. Used as a contemptuous form of address.
Sleekit — Unctuous, deceitful, crafty.
Sumpter horse — Pack animal, such as a horse or mule.
Surcoat, An outer tunic often worn over armor.
Tail — A noble’s following of men-at-arms.
Thralldom — One, such as a slave or serf, who is held in bondage.
Tisane — An herbal infusion drunk as a beverage, or for its mildly medicinal effect.
Tooing and froing — Coming and going.
Trailed — To drag (the body, for example) wearily or heavily.
Trebuchet — A medieval catapult-type siege engine for hurling heavy projectiles.
Trencher — A wooden plate or platter for food.
Trestle table — A table made up of two or three trestle supports over which a tabletop is placed.
Trews — Close-fitting trousers.
Villein — A medieval peasant or tenant farmer.
Wain — Open farm wagon.
Wattles — A fleshy, wrinkled, often brightly-colored fold of skin hanging from the neck.
Well-found — Well equipped, having everything needed or desirable.
Westering — To move westward.
Wheedling — To use flattery or cajolery to achieve one's ends.
Whey — The thin, watery part of milk separated from the curd.
Wheesht — To be silent, often used as an interjection to urge silence.
Worrit — Worry.
Wroth — Angry.