A Quick and Simple Dictionary

barnacle

1. Noun.  A marine crustacean of the subclass Cirripedia that attaches itself to submerged surfaces such as tidal rocks or the bottoms of ships.
2. Noun.  The barnacle goose.
3. Noun.  (context, engineering) In electrical engineering, a change made to a product on the manufacturing floor that was not part of the original product design.
4. Noun.  (context, computing) On printed circuit boards, a change such as soldering a wire in order to connect two points, or addition such as an added resistor or capacitor, subassembly or daughterboard.
5. Noun.  (obsolete) An instrument like a pair of pincers, to fix on the nose of a vicious horse while shoeing so as to make it more tractable.
6. Noun.  (archaic, British) A nickname for spectacles.
7. Noun.  (slang, obsolete) A good job, or snack easily obtained.
8. Verb.  To connect with or attach.
9. Verb.  To press close against something.