General English

General Science

  • noun a mammal with a sleek body and flippers that swims in cold seas


  • noun a special symbol, often one stamped on a piece of wax, which is used to show that a document is officially approved by the organisation that uses the symbol
  • noun a piece of paper, metal, or wax attached to close something, so that it can be opened only if the paper, metal, or wax is removed or broken


  • noun a device that joins two parts and prevents leakage
  • noun a way in which a liquid or a gas may be prevented from escaping
  • verb to join two parts in such a way as to prevent leakage


  • verb to attach a seal, to stamp something with a seal

Cars & Driving

  • noun a flexible ring, disc or washer that prevents the passage of liquid, air, gas or dirt
  • verb to prevent the passage of liquid, air, gas, etc. by means of a seal or sealant (e.g. on seams, joints, flanges)
  • verb to coat a surface (e.g. when undersealing a car) by closing the pores of the anodic oxide layer in order to increase the resistance to staining and its effectiveness against corrosion


  • A legal term used to describe the signature or other representation of an individual agreeing to the terms and conditions of an agreement or contract.


  • To close securely or hermetically to avoid any leaking in or out, of air, moisture, contaminants, light, radiation, or the like. Also, the hermeticity so obtained. Also, the process of conferring such hermeticity.
  • A material or device which serves to make a seal (1). Also, the hermeticity so conferred.
  • To affix a label or other binding which when broken evidences tampering. Also, such a label or binding.
  • To affix a label or other certificate which attests to the authenticity of something. Also, such a label.


  • noun a piece of wax or red paper attached to a document to show that it is legally valid
  • noun a mark put on a document by a court to show that it has been correctly issued by that court

Real Estate

  • noun a tight closure that prevents a substance such as air or water from entering or escaping

Origin & History of “seal”

Seal the animal (OE) and seal ‘impressed mark, closure’ (13th c.) are of course different words. The former goes back to a prehistoric Germanic *selkhaz, a word of unknown origin which also produced Swedish säl and Danish sæl. The latter was borrowed from Anglo-Norman seal, a descendant of Latin sigillum. this, a diminutive form of signum (from which English gets sign), meant ‘little mark or picture’, and came to be used for such a mark distinctive of a particular person.