Synonym: betray, betrayer, blabber, blackleg, bum, crumb, denounce, dirty dog, fink, git, give away, grass, informer, lowlife, puke, rotter, scab, scum bag, shit, shop, skunk, snitch, so-and-so, squealer, stag, stinker, stinkpot, strikebreaker, tell on. Similar words: rate, ratio, rating, or rather, operate, scratch, gratify, operator. Meaning: [ræt] 
n. 1. any of various long-tailed rodents similar to but larger than a mouse 2. someone who works (or provides workers) during a strike 3. a person who is deemed to be despicable or contemptible 4. one who reveals confidential information in return for money 5. a pad (usually made of hair) worn as part of a woman's coiffure. v. 1. desert one's party or group of friends, for example, for one's personal advantage 2. employ scabs or strike breakers in 3. take the place of work of someone on strike 4. give (hair) the appearance of being fuller by using a rat 5. catch rats, especially with dogs 6. give away information about somebody.
n. 1. any of various long-tailed rodents similar to but larger than a mouse 2. someone who works (or provides workers) during a strike 3. a person who is deemed to be despicable or contemptible 4. one who reveals confidential information in return for money 5. a pad (usually made of hair) worn as part of a woman's coiffure. v. 1. desert one's party or group of friends, for example, for one's personal advantage 2. employ scabs or strike breakers in 3. take the place of work of someone on strike 4. give (hair) the appearance of being fuller by using a rat 5. catch rats, especially with dogs 6. give away information about somebody. 
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91. The interesting result is the relation between how well the rat remembers, and how long ago it was taught its trick.
92. His feeding frenzy exhausted, he was torpid, unable to pay attention to the rat in her maze.
93. Studies on purified rat sciatic nerve Schwann cells have shown that proliferation invitro depends on mitogenic factors.
94. Miguel glared back like a cornered rat, lifting himself up with the stick.
95. If the snake so much as hiccups as the rat inches along, the market analysts and social prognosticators pounce.
96. He said he only wanted to kill himself and claimed he ate rat poison and planned to inhale car exhaust fumes.
97. The omnivorous black rat consumes seeds, flowers and fruits, and many small animals.
98. The rat is the unacceptable face of the environment; so is listeria and clostridium botulinum.
99. This rat wanted to eat ropes the way Gene Kelly wanted to sing and dance.
100. Looks like Rico got in on it, then decided like he was gon na rat to Spider.
101. You were looking like a drowned rat after our little foray into Puddephat's rooms.
102. She worried away at her husband like a small and angry rat tackling an even smaller rodent.
103. Perhaps they predicted her actions, a rat in a pre-set maze.
104. Rat sciatic nerve Schwann cells were assayed for incorporation of DNA synthesis precursors, as described.
105. We can see him serving the rat on the silver tray.
106. The investor doesn't start to smell a rat until the payments aren't coming in.
107. Somewhere in Ohio a doctor has been jailed for feeding rat poison to his colleagues.
108. Gullible hadn't been driving a great big lorry around the place and putting down rat poison.
109. Once poison has temporarily reduced rat populations to almost zero, predation by barn owls can slow the recovery.
110. At least we would be out of the rat race until I had worked up some seniority in my job.
111. More recent investigations with rat jejunal brush border membrane vesicles, however, have found evidence only for passive transport.
112. The ships have gone and so has the Black Rat, but the opportunist Brown Rat remains a threat ashore.
113. The rat turned, ran up the rope again and disappeared.
114. The adult rat provides another example: it has been found that cells in its prostate gland need the hormone testosterone.
115. Exposing rat cortex to the same stain produces uniform, moderately dense, labelling in the primary visual area.
116. Ralph tried to sound hearty and enthusiastic[sentencedict.com], but his voice struggled from him like a half-drowned river rat.
117. Underneath the sink he found a large tin of rat poison.
118. I would try to elude notice, but I stood out like a white rat at a tomcat convention.
119. There were also rat droppings and dead insects at the dirt-ridden August Moon restaurant.
120. She has a rat on top of the living room door on Christmas Day, for example, and it will last her two days.
More similar words: rate, ratio, rating, or rather, operate, scratch, gratify, operator, moderate, accurate, desperate, cooperate, tolerate, decorate, at any rate, operating, rather than, operation, generate, strategy, Democrat, migration, integrate, frustrate, narrative, elaborate, corporate, strategic, cooperative, incorporate.