Squid (skw&ibreve;d), n. [Cf. Squirt.] 1. (Zoöl.) Any one of numerous species of ten-armed cephalopods having a long, tapered body, and a caudal fin on each side; especially, any species of Loligo, Ommastrephes, and related genera. See Calamary, Decacerata, Dibranchiata.

&fist; Some of these squids are very abundant on the Atlantic coast of North America, and are used in large quantities for bait, especially in the cod fishery. The most abundant of the American squids are the northern squid (Ommastrephes illecebrosus), ranging from Southern New England to Newfoundland, and the southern squid (Loligo Pealii), ranging from Virginia to Massachusetts.

2. A fishhook with a piece of bright lead, bone, or other substance, fastened on its shank to imitate a squid.

Squid (skw&ibreve;d), n. [Cf. Squirt.] 1. (Zoöl.) Any one of numerous species of ten-armed cephalopods having a long, tapered body, and a caudal fin on each side; especially, any species of Loligo, Ommastrephes, and related genera. See Calamary, Decacerata, Dibranchiata.

&fist; Some of these squids are very abundant on the Atlantic coast of North America, and are used in large quantities for bait, especially in the cod fishery. The most abundant of the American squids are the northern squid (Ommastrephes illecebrosus), ranging from Southern New England to Newfoundland, and the southern squid (Loligo Pealii), ranging from Virginia to Massachusetts.

2. A fishhook with a piece of bright lead, bone, or other substance, fastened on its shank to imitate a squid.

• A sea animal with tentacles and a soft elongated body. Squids are able to swim by squirting water out of side jets with force.
  
• (Slang) A quid. A british pound note.
  
• (mildly pejorative): A sailor in the Navy.
  
• (derogatory) a motorcyclist, typically on a sportbike, who rides with minimum of safety gear, no rider training and poor skill while attempting to ride faster than their ability allows. The more experienced often perform dangerous stunts that, when performed on public roads, endanger themselves and other motorists. There is currently an entire culture devoted to it in which money is made selling videos of their stunts and performing at shows on closed race tracks. The term is derived from the 1960s when Navy sailors (colloquially “squids”) would dock in San Diego, purchase two-stroke motorcycles, and ride them around under the influence of alcohol.
  
• (slang) New England undergraduate slang for “study”. It appears to have originated in the early 1970s, and originally came from the fact that squids squirt ink. It is used by many to refer to people who are smart or those who study a lot.
  

• Superconducting QUantum Interference Device. A sensor that uses certain quantum effects to detect small magnetic fields.