• Trichina spiralis
    Trichina spiralis
  • WordNet 3.6
    • n trichina parasitic nematode occurring in the intestines of pigs and rats and human beings and producing larvae that form cysts in skeletal muscles
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Webster's Revised Unabridged Dictionary
    • n Trichina (Zoöl) A small, slender nematoid worm (Trichina spiralis) which, in the larval state, is parasitic, often in immense numbers, in the voluntary muscles of man, the hog, and many other animals. When insufficiently cooked meat containing the larvæ is swallowed by man, they are liberated and rapidly become adult, pair, and the ovoviviparous females produce in a short time large numbers of young which find their way into the muscles, either directly, or indirectly by means of the blood. Their presence in the muscles and the intestines in large numbers produces trichinosis.
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Century Dictionary and Cyclopedia
    • n trichina An important genus of nematoid worms, typical of the Trichinidæ. T. spiralis is a hair-like nematoid worm, which in the larval state is occasionally found encysted in large numbers in the muscular tissue of man and certain lower animals. In the adult state it may inhabit the intestinal tract of the same animal. It is the cause of trichinosis. The adult male is 1.5 millimeters, the female from 3 to 4 millimeters long. The female gives birth to immense numbers of embryos, about one tenth of a millimeter long. These pierce the walls of the intestine, and either enter the peritoneal cavity and thence find their way into the various muscles, or else enter blood-vessels and are carried passively by the blood-current into remote parts of the body. Having reached the muscular tissue, they at first travel a short distance between the fibers, then pierce the sarcolemma of some one fiber and enter its substance. When they have arrived at a certain maturity, and are from .6 to 1 millimeter long, they coil themselves up in the form of a spiral and become inclosed in elongated or lemon-shaped cysts about 4 millimeters long, the cyst rarely containing more than one worm. After a variable length of time, the cyst or capsule may become filled with lime-salts. The worm is thereby more or less obscured, but the cyst becomes visible to the naked eye as a minute white speck. The inclosed trichina may remain alive ten years and even longer, although it undergoes no further development until the muscular tissue containing it is consumed raw by man or some susceptible animal. It then becomes sexually mature in the intestines within two or three days, to give birth to embryos in five or six days more, thus completing the life-cycle. T. spiralis has been found in the muscular tissue of man, swine, cats, rats, hedgehogs, racoons, badgers, martens, marmots, and polecats, and in almost every part of the globe.
    • n trichina [lowercase; pl. trichinæ (-nē), sometimes trichinas (-näz).] A worm of this genus.
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Chambers's Twentieth Century Dictionary
    • n Trichina tri-kī′na a parasitic worm, which in its mature state infests the intestinal canal, and in its larval state the muscular tissue of man and certain animals, esp. the hog
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. hairy, made of hair, fr. tri`x tricho`s, hair
Chambers's Twentieth Century Dictionary
Gr. trichinos, small like a hair—thrix, trichos, hair.


In literature:

Owen named the insect Trichina spiralis.
"A History of Science, Volume 4(of 5)" by Henry Smith Williams
Murdered trichinae, when they boiled their hams.
"Punchinello, Vol. II., No. 34, November 19, 1870" by Various
Second: They may be diseased, and there is the possibility of their containing animal parasites, such as tapeworms and trichinae.
"Diet and Health" by Lulu Hunt Peters
Twelve trichinae have been found in a section of human muscle only one-twelfth of an inch square and one-fifth of an inch in thickness.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
Nuts are free from trichinae, tapeworm and other parasites, as well as the infections due to specific disease.
"Northern Nut Growers Association Report of the Proceedings at the" by Various
A prejudice has arisen against rats, because the doctors say that their flesh is full of trichinae.
"Diary of the Besieged Resident in Paris" by Henry Labouchère
It obviates the possibility of trichina infection absolutely.
"The Dominant Dollar" by Will Lillibridge
Heat destroys the "measles" and the trichina worms.
"The Home Medical Library, Volume I (of VI)" by Various
Millions of the young trichinae may live in the flesh of a pig without producing any particular difference in the appearance of the flesh.
"Rural Hygiene" by Henry N. Ogden
Other diseases also are caused by parasitic worms, such as tapeworms, pinworms, and trichinae.
"American Red Cross Text-Book on Home Hygiene and Care of the Sick" by Jane A. Delano
Give the statement in relation to trichina.
"A Treatise on Physiology and Hygiene" by Joseph Chrisman Hutchison
Name the host or hosts in the following cases: trichina, liver fluke, malarial parasite, tapeworm, hook worm.
"A Guide for the Study of Animals" by Worrallo Whitney
It is a credit to the people, though it be an offence in the trichina.
"The Jew" by Joseph Ignatius Kraszewski
Vinegar eels, the horsehair worm, the pork worm or trichina and the dread hookworm are examples.
"A Civic Biology" by George William Hunter
Of human parasites, the celebrated Trichinae, the Maw-worms, Whip-worms, etc., for example, belong to them.
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel

In news:

Agricultural Research Service (ARS) scientists are tracking how spread of the parasite trichinae (Trichinella spiralis) throughout Europe, North America and.
Despite the fact that modern production practices have virtually eliminated trichinae from the US hog population, some countries still restrict US pork exports.
Two recent studies show the time is near to tackle a trichinae -free certification program.