| invalidator | (n) an official who can invalidate or nullify, Syn. voider, nullifier, Example: my bank check was voided and I wanted to know who the invalidator was |
| collateral | (adj) serving to support or corroborate, Syn. substantiative, verifying, validatory, confirming, corroborative, substantiating, corroboratory, verificatory, confirmative, confirmatory, validating, Example: collateral evidence |