| cross head(noun, technology, entity, form, concept) |
| cruise(noun, travel) |
| crystal surface(noun, surface, side, aspect, boundary) |
| curta(noun, technology, entity, form, concept) |
| data recall diamond(noun, technology, entity, form, concept) |
| demi-cross(noun, technology, entity, form, concept) |
| dial face(noun, technology, entity, form, concept) |
| dial plate(noun, technology, entity, form, concept) |
| dialing scale(noun, technology, entity, form, concept) |
| difference engine(noun, technology, entity, form, concept) |
| digital sundial(noun, technology, entity, form, concept) |
| dioptra(noun, technology, entity, form, concept) |
| discontinued media format(noun, technology, entity, form, concept) |
| dividing engine(noun, technology, entity, form, concept) |
| do(noun, travel) |
| dot matrix teletypewriter(noun, technology, entity, form, concept) |
| drag(noun, travel) |
| drift(noun, travel) |
| drive(noun, travel) |
| duplex locomotive(noun, technology, entity, form, concept) |