often in the form of a cylinder or ring, having a raised (cut) or incised (engraved) emblem, such as a heraldic device or monogram. A seal is used to stamp an impression on wax or lead as a means of authentication or to seal closed a document or letter. [Arts] 
n., A stamp, carved cylinder, signet ring, etc., used to make an impression in molten wax to secure a letter or other document,
confirming the identity of the sender and/or the authenticity of the contents. Also refers to the impressed design or mark