Belonging in the Stone Age.

A perpend. / (Scotland and northern England) A horizontal slab acting as a gravestone.

(of a wall, bridge or building) Constructed by laying carefully selected stones on top of each other, and bedding them down with no mortar.

Alternative form of stepping stone

(archaeology, paleontology) A broad prehistoric period during which humans widely used stone for toolmaking. / (figuratively, informal) Any extremely primitive or undeveloped era.

A stone that can be stepped on in crossing something, especially a marsh or creek. / (idiomatic) Something used as a way to progress to something or somewhere else.

Alternative form of philosopher's stone.

(UK, Australia, colloquial) Generalized expression of surprise or amazement, or just for emphasis.

Any of several species of large terrestrial birds in the family Burhinidae.

(idiomatic) Utterly deaf.