Definition of Rat

1. Noun. Any of various long-tailed rodents similar to but larger than a mouse.

2. Verb. Desert one's party or group of friends, for example, for one's personal advantage.
Generic synonyms: Defect, Desert
Derivative terms: Ratter

3. Noun. Someone who works (or provides workers) during a strike.
Exact synonyms: Blackleg, Scab, Strikebreaker
Generic synonyms: Worker
Derivative terms: Blackleg, Scab

4. Verb. Employ scabs or strike breakers in.
Category relationships: Industry, Manufacture
Generic synonyms: Employ, Engage, Hire
Derivative terms: Ratter

5. Noun. A person who is deemed to be despicable or contemptible. "The British call a contemptible person a `git'"
Exact synonyms: Bum, Crumb, Dirty Dog, Git, Lowlife, Puke, Rotter, Scum Bag, Skunk, So-and-so, Stinker, Stinkpot
Generic synonyms: Disagreeable Person, Unpleasant Person
Derivative terms: Bum

6. Verb. Take the place of work of someone on strike.
Exact synonyms: Blackleg, Fink, Scab
Generic synonyms: Do Work, Work
Derivative terms: Blackleg, Ratter, Scab

7. Noun. One who reveals confidential information in return for money.

8. Verb. Give (hair) the appearance of being fuller by using a rat.
Generic synonyms: Fill Out, Pad

9. Noun. A pad (usually made of hair) worn as part of a woman's coiffure.
Generic synonyms: Pad
Group relationships: Coif, Coiffure, Hair Style, Hairdo, Hairstyle

10. Verb. Catch rats, especially with dogs.
Generic synonyms: Capture, Catch
Derivative terms: Ratter

11. Verb. Give away information about somebody. "He told on his classmate who had cheated on the exam"
Exact synonyms: Betray, Denounce, Give Away, Grass, Shit, Shop, Snitch, Stag, Tell On
Generic synonyms: Inform
Specialized synonyms: Sell Out
Derivative terms: Betrayer, Ratter, Ratting, Shit, Shit, Snitch, Snitcher

Definition of Rat

1. n. One of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. decumanus), the black rat (M. rattus), and the roof rat (M. Alexandrinus). These were introduced into America from the Old World.

2. v. i. In English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union.

Definition of Rat

1. Noun. (zoology) Any of about 56 different species of small, omnivorous rodents belonging to the genus ''Rattus''. ¹

2. Noun. (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. ¹

3. Noun. (informal) A person who is known for betrayal; a scoundrel; a quisling. ¹

4. Noun. (informal) An informant or snitch ¹

5. Noun. (slang) A person who routinely spends time at a particular location. ¹

6. Noun. Scab ¹

7. Noun. North West London slang term for vagina, as in ''get your '''rat''' out. ¹

8. Noun. A wad of shed hair used as part of a hairstyle. ¹

9. Verb. (context: usually with “on” or “out”) to betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray. ¹

10. Verb. (context: of a dog, etc.) To kill rats. ¹

¹ Source:

Definition of Rat

1. to hunt rats (long-tailed rodents) [v RATTED, RATTING, RATS]

Medical Definition of Rat

1. 1. One of the several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. Alexandrinus). These were introduced into Anerica from the Old World. 2. A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair. 3. One who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union. "It so chanced that, not long after the accession of the house of Hanover, some of the brown, that is the German or Norway, rats, were first brought over to this country (in some timber as is said); and being much stronger than the black, or, till then, the common, rats, they in many places quite extirpated the latter. The word (both the noun and the verb to rat) was first, as we have seen, leveled at the converts to the government of George the First, but has by degrees obtained a wide meaning, and come to be applied to any sudden and mercenary change in politics." Bamboo rat, any American rat of the genus Neotoma, especially N. Floridana, common in the Southern United States. Its feet and belly are white. Origin: AS. Raet; akin to D. Rat, OHG. Rato, ratta, G. Ratte, ratze, OLG. Ratta, LG. & Dan. Rotte, Sw. Ratta, F. Rat, Ir. & Gael radan, Armor. Raz, of unknown origin. Cf. Raccoon. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Rat

rat's-tail cactus
rat-bite disease
rat-bite fever
rat-flea typhus
rat-tail file

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