Chapter Seacoast to Sea louse of S by Webster's Dictionary (1913 Edition)

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.

Seal
(Seal), v. t. [imp. & p. p. Sealed ; p. pr. & vb. n. Sealing.] [OE. selen; cf. OF. seeler, seieler, F. sceller, LL. sigillare. See Seal a stamp.]

1. To set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed.

And with my hand I seal my true heart's love.

Shak.

2. To mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality; as, to seal weights and measures; to seal silverware.

3. To fasten with a seal; to attach together with a wafer, wax, or other substance causing adhesion; as, to seal a letter.

4. Hence, to shut close; to keep close; to make fast; to keep secure or secret.

Seal up your lips, and give no words but "mum".

Shak.

5. To fix, as a piece of iron in a wall, with cement, plaster, or the like. Gwilt.

6. To close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5.

7. Among the Mormons, to confirm or set apart as a second or additional wife. [Utah, U.S.]

If a man once married desires a second helpmate . . . she is sealed to him under the solemn sanction of the church.

H. Stansbury.

Seal
(Seal), v. i. To affix one's seal, or a seal. [Obs.]

I will seal unto this bond.

Shak.

Sea laces
(Sea" la"ces) (Bot.) A kind of seaweed (Chorda Filum) having blackish cordlike fronds, often many feet long.

Sea lamprey
(Sea" lam"prey) (Zoöl.) The common lamprey.

Sea language
(Sea" lan"guage) The peculiar language or phraseology of seamen; sailor's cant.

Sea lark
(Sea" lark`) (Zoöl.) (a) The rock pipit (b) Any one of several small sandpipers and plovers, as the ringed plover, the turnstone, the dunlin, and the sanderling.