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rat meaning

EN[ɹæt] [-æt]
US UK
WRat
  • Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus.
  • Rats are typically distinguished from mice by their size. Generally, when someone discovers a large muroid rodent, its common name includes the term rat, while if it is smaller, the name includes the term mouse.
FR rat
rat
rat

    Definition of rat in English Dictionary

  • NounPLrats
    1. (zoology) A medium-sized rodent belonging to the genus Rattus.
      1. Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems—surgical foam, a thermal gel depot, a microcapsule or biodegradable polymer beads.
    2. INF 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. INF A person who is known for betrayal; a scoundrel; a quisling.
        1. INF An informant or snitch.
          1. SLA A person who routinely spends time at a particular location.
            1. Our teenager has become a mall rat. ‎
            2. He loved hockey and was a devoted rink rat. ‎
          2. Scab.
            1. (north-west London) SLA Vagina.
              1. Get your rat out. ‎
            2. A wad of shed hair used as part of a hairstyle.
            3. VerbSGratsPRrattingPT, PPratted
              1. (usually with “on” or “out”) To betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray.
                1. He ratted on his coworker.
                2. He is going to rat us out!
              2. (of a dog, etc.) To kill rats.
              3. More Examples
                1. Used in the Middle of Sentence
                  • We also tested the rats for neurofunction at 28 days and examined the relationships between the imaging findings, neurofunction and the resulting histology from this unique injury model.
                  • The rats came pouring out of every possible opening in the burning warehouse.
                  • It was also shown that gene expression in the rat brain, although similar, differs between cortical regions, with 30 genes found to be enriched in the frontomedial cortex [51 ,52 ].
                2. Used in the Beginning of Sentence
                  • Rats were received d-amphetamine sulfate (5.0 mg/kg i.p) and were placed in rotometer bowls.
                3. Used in the Ending of Sentence
                  • After four to eight days of incubation, this biolung was grafted on to a rat.
                  • At the request of Defence Food Research Laboratory, 14 new anacardic compounds synthesised from tetrahydroanacardol were screened for toxicity to insect and albino rats.
                  • A selective COX-2 inhibitor, etoricoxib, was reported to reduce the expression of NF-κB protein and inhibit DMH-induced colon ACF in rats.
              • Part-of-Speech Hierarchy
                1. Nouns
                  • Countable nouns
                  • Verbs
                  Related Links:
                  1. en rather
                  2. fr rate
                  3. en rate
                  4. en rational
                  5. en rates
                  Source: Wiktionary

                  Meaning of rat for the defined word.

                  Grammatically, this word "rat" is a noun, more specifically, a countable noun. It's also a verb.
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                  Definiteness: Level 9
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