broadseal

from The Century Dictionary.

• noun The official or great seal of a country or state: as, “the king's broad-seal,”
• To stamp as with the broad seal; guarantee; make sure.

from the GNU version of the Collaborative International Dictionary of English.

• The great seal of England; the public seal of a country or state.
• transitive verb obsolete To stamp with the broad seal; to make sure; to guarantee or warrant.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb obsolete, rare, transitive To stamp with the broad seal; to make sure; to guarantee or warrant.