What is "seal lock"

Seal \Seal\, n. [OE. seel, OF. seel, F. sceau, fr. L. sigillum a little figure or image, a seal, dim. of signum a mark, sign, figure, or image. See Sign, n., and cf. Sigil.]

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.''
   --Milton.

   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.
   --Shak.