Definition and Meanings for rat

·This dictionary definitions come from open dictionary GNU Collaborative International Dictionary of English.
·The meaning of a word in English varies according to its part of speech , for this reason the different meanings are ordered by their part of speech.
·It is a very easy to use dictionary , very well structured that will allow you to solve all your doubts on any word and you also will deepen the knowledge of the English language.


Rat is ranked 28,517 in the ranking of most used words in English

Part of Speech of rat

noun, intransitive verb, imperfect, past participle, present participle, verbal noun

Etymology of rat

as. r; akin to d. rat, ohg. rato, ratta, g. ratte, ratze, olg. ratta, lg. & dan. rotte, sw. r, f. rat, ir. & gael radan, armor. raz, of unknown origin. cf. raccoon

Meaning of rat


as noun

  • one of several species of small rodents of the genus rattus (formerly included in mus) and allied genera, of the family muridae, distinguished from mice primarily by being larger. they infest houses, stores, and ships, especially the norway rat, also called brown rat, (rattus norvegicus formerly mus decumanus), the black rat (rattus rattus formerly mus rattus), and the roof rat (formerly mus alexandrinus, now included in rattus rattus). these were introduced into america from the old world. the white rat used most commonly in laboratories is primarily a strain derived from rattus rattus.
  • a round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair.
  • one who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union.

as intransitive verb, imperfect, past participle, present participle, verbal noun

  • 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.
  • to catch or kill rats.
  • to be an informer (against an associate); to inform (on an associate); to squeal; -- used commonly in the phrase to rat on.
  • No antonyms for rat

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