T
Tithe: This was originally a tenth of land or produce that was allotted for church purposes. It can also refer to the rent paid in lieu of land or produce.
Trebuchet: A siege engine which consisted of a central pole between two A-frames. On one end of the pole was a large weight and other the other a bucket full of rocks, animal carcasses etc. The weighted end would be winched up and then allowed to drop which would cause the bucket end to fly up flinging its contents at the castle wall.
Trefoiled: 3-leaved.
Tufa: A porous limestone that could be easily cut and dried to make a light weight building material.