Sinonim coign

English Thesaurus

1. the keystone of an arch (noun.artifact)

hypernym	:	headstone, key, keystone,
definition	:	the central building block at the top of an arch or vault (noun.artifact)

2. expandable metal or wooden wedge used by printers to lock up a form within a chase (noun.artifact)

hypernym	:	wedge,
definition	:	something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them (noun.artifact)