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From: Webster's Revised Unabridged Dictionary (1913)

 Seal, n.
 1. An engraved or inscribed stamp, used for marking an impression in wax or other soft substance, to be attached to a document, or otherwise used by way of authentication or security.
 2. Wax, wafer, or other tenacious substance, set to an instrument, and impressed or stamped with a seal; as, to give a deed under hand and seal.
 Till thou canst rail the seal from off my bond
 Thou but offend'st thy lungs to speak so loud.   --Shak.
 3. That which seals or fastens; esp., the wax or wafer placed on a letter or other closed paper, etc., to fasten it.
 4. That which confirms, ratifies, or makes stable; that which authenticates; that which secures; assurance. “Under the seal of silence.”
 Like a red seal is the setting sun
 On the good and the evil men have done.   --Longfellow.
 5. An arrangement for preventing the entrance or return of gas or air into a pipe, by which the open end of the pipe dips beneath the surface of water or other liquid, or a deep bend or sag in the pipe is filled with the liquid; a draintrap.
 Great seal. See under Great.
 Privy seal. See under Privy, a.
 Seal lock, a lock in which the keyhole is covered by a seal in such a way that the lock can not be opened without rupturing the seal.
 Seal manual. See under Manual, a.
 Seal ring, a ring having a seal engraved on it, or ornamented with a device resembling a seal; a signet ring.