
| Bailey or Ward | The ground enclosed by a protecting wall. |
| Barbican | The outer defence, frequently a twin-towered gateway on the castle side of the moat. |
| Bastion | A specially strengthened projection, or tower, at an angle of the wall. |
| Battlement | An indented wall around a tower or wall. The raised parts are known as Cops, or Merlons, and the spaces between are Embrasures or Crenelles. |
| Crenellated | Provided with battlements, or loopholes, through which missiles could be discharged. |
| Curtain Wall | The defensive wall between two towers. |
| Drawbridge | The bridge spanning the moat. Hinged at one end and free at the other. It could be drawn up when required to prevent entry. |
| Embrasure | The open space in the battlement, widened to allow ample room for an archer. |
| Enceinte | The outer encircling wall. |
| Garderobe | A latrine. |
| Keep | The single tower of a castle. |
| Machincolation | A projecting parapet on the castle wall with gaps between the supporting brackets through which stones or boiling liquids could be dropped upon invaders. |
| Moat | A wide. deep ditch surrounding the castle, usually filled with water. |
| Postern Gate | A small gate in the caste wall. |
| Portcullis | A heavy grating of ironbound wood with spikes along the bottom and made to slide up and down between the side towers of an entrance gate. |
| Solar | A withdrawing room, exposed to the sun. |
| Ward | An alternative term for a bailey. |
| Well House | A building above a well head. |
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