keystone
English Thesaurus
1. the central building block at the top of an arch or vault (noun.artifact)
| hypernym | : | building block, |
| definition | : | a block of material used in construction work (noun.artifact) |
| part meronym | : | arch, |
| definition | : | (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it (noun.artifact) |
2. a central cohesive source of support and stability (noun.cognition)
| hypernym | : | support, |
| definition | : | something providing immaterial assistance to a person or cause or interest (noun.cognition) |
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