FluentPlex

seal

/siːl/ noun C2
  1. A stamp used to impress a design on a soft substance such as wax.
  2. An impression of such stamp on wax, paper or other material used for sealing.
  3. A facsimile of an impression of such stamp that is a mark or symbol of an office or organisation. · The front of the podium bore the presidential seal.
  4. Anything that secures or authenticates.
  5. Something which will be visibly damaged if a covering or container is opened, and which may or may not bear an official design. · The result was declared invalid, as the seal on the meter had been broken.
  6. Confirmation or approval, or an indication of this. (figuratively) · Her clothes always had her mom's seal of approval.
  7. Something designed to prevent liquids or gases from leaking through a joint. · The canister is leaking. I think the main seal needs to be replaced.
  8. A tight closure, secure against leakage. · Close the lid tightly to get a good seal.

Plural seals

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From the library

Anne looked at the still face and there beheld the seal of the Great Presence.
Anne of Green Gables, p. 311 · C1
It was the simplest thing in the world for him to take a wax impression from the seal, to moisten it in as much blood as he could get from a pin-prick, and to put the mark upon the wall during the night, either with his own hand or with that of his housekeeper.
The Return of Sherlock Holmes, p. 64 · C1
If you examine among those documents which he took with him into his retreat, I will lay you a wager that you find the seal with the thumb-mark upon it.”
The Return of Sherlock Holmes, p. 64 · C1
Such things,” continued Bertuccio, shaking his head, “are only related under the seal of confession.”
The Count of Monte Cristo, p. 463 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.