- The definition of a rat is a rodent with a lengthy tail, or is slang for a sneaky person.
- An example of a rat is a roof rat.
- An example of a rat is a person who plays mean tricks on his coworkers.
- Rat is defined as to tease hair, or to hunt for rats, or is slang for betray.
- An example of rat is to poof the front of the hair.
- An example of rat is for a cat to hunt for rats.
- An example of rat is to tattle on a friend.
A grey rat.
- any of numerous long-tailed rodents of various families (esp. Muridae and Cricetidae) resembling, but larger than, the mouse: rats are very destructive pests and carriers of highly contagious diseases, as bubonic plague and typhus
- ☆ a small pad formerly used in certain styles of women's coiffures to make the hair look thicker
- Slang a sneaky, contemptible person; specif.,
- an informer; stool pigeon
- a worker who is a scab
- a person who deserts or betrays a cause
- Slang a person who spends a great deal of time at, in, or on a (specified) place: a gym rat, a mall rat
Origin of ratMiddle English ratte ; from Old English ræt, akin to German ratz, ratte ; from Proto-Germanic an unverified form ratto ; from uncertain or unknown; perhaps Indo-European base an unverified form red-, an unverified form rōd-, to scratch, gnaw from source Classical Latin radere, to scrape, rodere, to gnaw
intransitive verbratted, ratting
- to hunt for rats, esp. with dogs
- to desert or betray a cause, movement, etc. as rats are reputed to desert a sinking ship
- to act as a stool pigeon; inform (on)
smell a rat
- a. Any of various long-tailed rodents resembling mice but larger, especially one of the genus Rattus.b. Any of various animals similar to one of these long-tailed rodents.
- Slang a. A despicable person, especially one who betrays or informs upon associates.b. A scab laborer.
- A pad of material, typically hair, worn as part of a woman's coiffure to puff out her own hair.
- Slang A person who frequently passes time at a particular place. Often used in combination: a rink rat.
verbrat·ted, rat·ting, rats
- To hunt for or catch rats, especially with the aid of dogs.
- Slang To reveal incriminating or embarrassing information about someone, especially to a person in authority: ratted on his best friend to the police.
- Slang To work as a scab laborer.
Origin of ratMiddle English, from Old English ræt; see rēd- in Indo-European roots.
- (zoology) A medium-sized rodent belonging to the genus Rattus.
- (informal) A term indiscriminately applied to numerous members of several rodent families (e.g. voles and mice) having bodies longer than about 12 cm, or 5 inches.
- (informal) A person who is known for betrayal; a scoundrel; a quisling.
- What a rat, leaving us stranded here!
- (informal) An informant or snitch.
- (slang) A person who routinely spends time at a particular location.
- Our teenager has become a mall rat.
- He loved hockey and was a devoted rink rat.
- (north-west London, slang) Vagina.
- Get your rat out.
- A wad of shed hair used as part of a hairstyle.
(third-person singular simple present rats, present participle ratting, simple past and past participle ratted)
From Middle English rat, rotte, from Old English ræt, from Proto-Germanic *rattaz, *ratō (compare West Frisian rôt, Dutch rat, dialectal German Ratz), from Proto-Indo-European *Hreh₃d- (“to scrape”) (compare Welsh rhathu (“to grate, rasp”), Latin rōdō (“to gnaw”), rōstrum (“beak, prow”), Middle Persian randītan (“to scrape, smooth”), Sanskrit rádati (“he gnaws, cuts”)).
rat - Computer Definition
(Remote Access Trojan) Software in a user's machine that is interactively controlled by an attacker. Having full administrator rights, the attacker can perform any operation in the computer remotely and direct the RAT in the infected machine just like a user with a Web browser requests data from a server. The Cult of the Dead hackers created the classic RAT (see Back Orifice). See Trojan.