Aposematic ~ Colored as a warning. Describes natural colors and bright markings on an animal that warn predators that it is poisonous. (some humans where T-shirts with such warnings)
Citadel ~ ( Latin, 'city') a fortress or strongly fortified building in or near a city, used as a place of refuge. A defending body, an organization or institution that strongly defends a particular way of life or principle.
Macadam ~ (Scottish) A smooth hard road surface made from small broken pieces of stone usually mixed with tar or asphalt in compressed layers (so goes the heart)