General English

General Science

Cars & Driving

  • noun a seal that stops fluid under pressure leaking past a rotating or reciprocating shaft or rod


  • In plumbing, a brass or copper ring that is compressed by a screwed fitting over a copper tube, and that deforms to become a seal between the two.
  • In electrical work, a seal used to prevent water from entering the end of a cable.


  • noun an organ in the body containing cells that secrete substances such as hormones, sweat or saliva which act elsewhere