| tun | 1. A large cask; an oblong vessel bulging in the middle, like a pipe or puncheon, and girt with hoops; a wine cask. 2. A fermenting vat. 3. A certain measure for liquids, as for wine, equal to two pipes, four hogsheads, or 252 gallons. In different countries, the tun differs in quantity. 4. A weight of 2,240 pounds. See Ton. 5. An indefinite large quantity. "A tun of man in thy large bulk is writ." (Dryden) 6. A drunkard; so called humorously, or in contempt. 7. <zoology> Any shell belonging to Dolium and allied genera; called also tun-shell. Origin: AS. Tunne. See Ton a weight. Source: Websters Dictionary (01 Mar 1998) |
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| tuna | <botany> The Opuntia Tuna. See Prickly pear, under Prickly. <zoology> The tunny. The bonito. Origin: Cf. Tunny. Source: Websters Dictionary (01 Mar 1998) |
| Tunga penetrans | <entomology> A member of the flea family, Tungidae, commonly known as chigger flea, sand flea, chigoe, or jiggers. The minute female penetrates the skin, frequently under the toenails; as she becomes distended with eggs to about pea size, a painful ulcer with inflammation develops at the site. Synonym: Sarcopsylla penetrans. (05 Mar 2000) |
| tungiasis | Infestation with sand fleas (Tunga penetrans) (05 Mar 2000) |
| Tungidae | <entomology> A family of fleas containing the jigger or chigoe flea species, Tunga penetrans. (05 Mar 2000) |
| tungstate | <chemistry> A salt of tungstic acid; a wolframate. Origin: Cf. F. Tungstate. Source: Websters Dictionary (01 Mar 1998) |
| tungsten | 1. <chemistry, element> A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. 2 <chemical> Scheelite, or calcium tungstate. Tungsten ocher, or Tungstic ocher, tungstate. Abbreviation: W Origin: Sw. Tungsten (cf. Dan. Tungsteen, G. Tungstein); tung heavy (akin to Dan. Tung, Icel. Thungr) + sten stone. (Wolframium). (30 Mar 1998) |
| tungsten arc lamp | <apparatus> A lamp having highly compressed tungsten elements. (05 Mar 2000) |
| tungsten carbide | <chemical> One of the hardest known materials, used as an abrasive and in the manufacture of dental cutting instruments. (05 Mar 2000) |
| tungsten compounds | Inorganic compounds that contain tungsten as an integral part of the molecule. (12 Dec 1998) |
| tungstic | <chemistry> Of or pertaining to tungsten; derived from, or resembling, tungsten; wolframic; as, tungstic oxide. Tungstic acid, an acid of tungsten, H2WO4, analogous to sulphuric and chromic acids. Source: Websters Dictionary (01 Mar 1998) |
| tungstite | <chemical> The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram. Source: Websters Dictionary (01 Mar 1998) |
| tunguses | <ethnology> A group of roving Turanian tribes occupying Eastern Siberia and the Amoor valley. They resemble the Mongols. Alternative forms: Tungooses. Source: Websters Dictionary (01 Mar 1998) |
| tunhoof | <botany> Ground ivy; alehoof. Origin: Cf. Aleboof. Source: Websters Dictionary (01 Mar 1998) |
| tunic | <botany> Thin membranous or fibrous outer layers of a bulb or corm. (09 Oct 1997) |