key block
/ˈkiː blɒk/noun
1A block placed at the summit of an arch or other structure, locking the whole together; a keystone.
2 Printing and Printmaking. = keystone.
3In quarrying: the first block or blocks to be removed from a new layer of stone.
Origin
Early 19th century; earliest use found in Literary Gazette. From key + block.
- sympathetic magic
- sympathetic smoker
- sympathetic string
- sympathique
- sympathise
- sympathiser
- sympathize
- sympathizer
- sympatholytic
- sympathomimetic
- sympathy
- sympatric
- sympatry
- sympetalous
- sympetaly
- symphonic
- symphonically
- symphonic poem
- symphonious
- symphonist
- symphony
- symphony orchestra
- Symphyla
- symphylan
- symphyseal