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4 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 black rat 名詞
 黑鼠

From: Webster's Revised Unabridged Dictionary (1913)

 Rat n.
 1. Zool. 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.
 2. A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair. [Local, U.S.]
 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. [Cant]
 Note:“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 wider meaning, and come to be applied to any sudden and mercenary change in politics.”
 Bamboo rat Zool., any Indian rodent of the genus Rhizomys.
 Beaver rat, Coast rat. Zool. See under Beaver and Coast.
 Blind rat Zool., the mole rat.
 Cotton rat Zool., a long-haired rat (Sigmodon hispidus), native of the Southern United States and Mexico. It makes its nest of cotton and is often injurious to the crop.
 Ground rat. See Ground Pig, under Ground.
 Hedgehog rat. See under Hedgehog.
 Kangaroo rat Zool., the potoroo.
 Norway rat Zool., the common brown rat. See Rat.
 Pouched rat. Zool. (a) See Pocket Gopher, under Pocket. (b) Any African rodent of the genus Cricetomys. Rat Indians Ethnol., a tribe of Indians dwelling near Fort Ukon, Alaska.  They belong to the Athabascan stock.
 Rat mole. Zool. See Mole rat, under Mole.
 Rat pit, an inclosed space into which rats are put to be killed by a dog for sport.
 Rat snake Zool., a large colubrine snake (Ptyas mucosus) very common in India and Ceylon.  It enters dwellings, and destroys rats, chickens, etc.
 Spiny rat Zool., any South American rodent of the genus Echinomys.
 To smell a rat. See under Smell.
 Wood rat Zool., any American rat of the genus Neotoma, especially Neotoma Floridana, common in the Southern United States. Its feet and belly are white.

From: Webster's Revised Unabridged Dictionary (1913)

 Black a.
 1. Destitute of light, or incapable of reflecting it; of the color of soot or coal; of the darkest or a very dark color, the opposite of white; characterized by such a color; as, black cloth; black hair or eyes.
    O night, with hue so black!   --Shak.
 2. In a less literal sense: Enveloped or shrouded in darkness; very dark or gloomy; as, a black night; the heavens black with clouds.
    I spy a black, suspicious, threatening cloud.   --Shak.
 3. Fig.: Dismal, gloomy, or forbidding, like darkness; destitute of moral light or goodness; atrociously wicked; cruel; mournful; calamitous; horrible.  “This day's black fate.”   Black villainy.”  “Arise, black vengeance.”  “Black day.” Black despair.”
 4. Expressing menace, or discontent; threatening; sullen; foreboding; as, to regard one with black looks.
 Note:Black is often used in self-explaining compound words; as, black-eyed, black-faced, black-haired, black-visaged.
 Black act, the English statute 9 George I, which makes it a felony to appear armed in any park or warren, etc., or to hunt or steal deer, etc., with the face blackened or disguised. Subsequent acts inflicting heavy penalties for malicious injuries to cattle and machinery have been called black acts.
 Black angel Zool., a fish of the West Indies and Florida (Holacanthus tricolor), with the head and tail yellow, and the middle of the body black.
 Black antimony Chem., the black sulphide of antimony, Sb2S3, used in pyrotechnics, etc.
 Black bear Zool., the common American bear (Ursus Americanus).
 Black beast. See Bête noire.
 Black beetle Zool., the common large cockroach (Blatta orientalis).
 Black bonnet Zool., the black-headed bunting (Embriza Schœniclus) of Europe.
 Black canker, a disease in turnips and other crops, produced by a species of caterpillar.
 Black cat Zool., the fisher, a quadruped of North America allied to the sable, but larger. See Fisher.
 Black cattle, any bovine cattle reared for slaughter, in distinction from dairy cattle. [Eng.]
 Black cherry. See under Cherry.
 Black cockatoo Zool., the palm cockatoo. See Cockatoo.
 Black copper. Same as Melaconite.
 Black currant. Bot. See Currant.
 Black diamond. Min. See Carbonado.
 Black draught Med., a cathartic medicine, composed of senna and magnesia.
 Black drop Med., vinegar of opium; a narcotic preparation consisting essentially of a solution of opium in vinegar.
 Black earth, mold; earth of a dark color. --Woodward.
 Black flag, the flag of a pirate, often bearing in white a skull and crossbones; a signal of defiance.
 Black flea Zool., a flea beetle (Haltica nemorum) injurious to turnips.
 Black flux, a mixture of carbonate of potash and charcoal, obtained by deflagrating tartar with half its weight of niter. --Brande & C.
 Black Forest [a translation of G. Schwarzwald], a forest in Baden and Würtemburg, in Germany; a part of the ancient Hercynian forest.
 Black game, or Black grouse. Zool. See Blackcock, Grouse, and Heath grouse.
 Black grass Bot., a grasslike rush of the species Juncus Gerardi, growing on salt marshes, and making good hay.
 Black gum Bot., an American tree, the tupelo or pepperidge. See Tupelo.
 Black Hamburg (grape) Bot., a sweet and juicy variety of dark purple or “black” grape.
 Black horse Zool., a fish of the Mississippi valley (Cycleptus elongatus), of the sucker family; the Missouri sucker.
 Black lemur Zool., the Lemurniger of Madagascar; the acoumbo of the natives.
 Black list, a list of persons who are for some reason thought deserving of censure or punishment; -- esp. a list of persons stigmatized as insolvent or untrustworthy, made for the protection of tradesmen or employers. See Blacklist, v. t.
 Black manganese Chem., the black oxide of manganese, MnO2.
 Black Maria, the close wagon in which prisoners are carried to or from jail.
 Black martin Zool., the chimney swift. See Swift.
 Black moss Bot., the common so-called long moss of the southern United States. See Tillandsia.
 Black oak. See under Oak.
 Black ocher. See Wad.
 Black pigment, a very fine, light carbonaceous substance, or lampblack, prepared chiefly for the manufacture of printers' ink. It is obtained by burning common coal tar.
 Black plate, sheet iron before it is tinned. --Knight.
 Black quarter, malignant anthrax with engorgement of a shoulder or quarter, etc., as of an ox.
 Black rat Zool., one of the species of rats (Mus rattus), commonly infesting houses.
 Black rent. See Blackmail, n., 3.
 Black rust, a disease of wheat, in which a black, moist matter is deposited in the fissures of the grain.
 Black sheep, one in a family or company who is unlike the rest, and makes trouble.
 Black silver. Min. See under Silver.
 Black and tan, black mixed or spotted with tan color or reddish brown; -- used in describing certain breeds of dogs.
 Black tea. See under Tea.
 Black tin Mining, tin ore (cassiterite), when dressed, stamped and washed, ready for smelting. It is in the form of a black powder, like fine sand. --Knight.
 Black walnut. See under Walnut.
 Black warrior Zool., an American hawk (Buteo Harlani).
 Syn: -- Dark; murky; pitchy; inky; somber; dusky; gloomy; swart; Cimmerian; ebon; atrocious.

From: WordNet (r) 2.0

 black rat
      n : common household pest originally from Asia that has spread
          worldwide [syn: roof rat, Rattus rattus]