| Swiss mouse leukaemia virus | A murine leukaemia virus producing leukaemia of the reticulum-cell type with massive infiltration of liver, spleen, and bone marrow. It infects dba/2 and swiss mice. (12 Dec 1998) |
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| Swiss type agammaglobulinaemia | Group of rare congenital disorders characterised by impairment of both humoral and cell-mediated immunity, leukopenia, and low or absent antibody levels. It is inherited as an x-linked or autosomal recessive defect. About half of the patients with autosomal recessive scid are deficient in the enzyme adenosine deaminase. (12 Dec 1998) |
| switch | 1. To strike with a switch or small flexible rod; to whip. 2. To swing or whisk; as, to switch a cane. 3. To trim, as, a hedge. 4. To turn from one railway track to another; to transfer by a switch; generally with off, from, etc.; as, to switch off a train; to switch a car from one track to another. 5. To shift to another circuit. Origin: Switched; Switching. 1. A small, flexible twig or rod. "Mauritania, on the fifth medal, leads a horse with something like a thread; in her other hand she holds a switch." (Addison) 2. A movable part of a rail; or of opposite rails, for transferring cars from one track to another. 3. A separate mass or trees of hair, or of some substance (at jute) made to resemble hair, worn on the head by women. 4. A mechanical device for shifting an electric current to another circuit. Safety switch, an arrangement of tracks whereby elevations otherwise insurmountable are passed. The track ascends by a series of zigzags, the engine running alternately forward and back, until the summit is reached. <physics> Switch board, a collection of switches in one piece of apparatus, so arranged that a number of circuits may be connected or combined in any desired manner. Switch grass. <botany> See Grass. Origin: Cf. OD. Swick a scourage, a whip. Cf. Swink, Swing. Source: Websters Dictionary (01 Mar 1998) |
| switch region | <molecular biology> The nucleotide sequences in heavy chain immunoglobulin genes located in the introns at the 5' end of each CH locus concerned with DNA recombination events that lead to changes in the type of heavy chain produced by a B-cell, for example IgM to IgG switching. These regions are highly conserved sequences. See: isotype switching. (19 Jan 1998) |
| switching | 1. Making a shift or exchange. 2. The movement of a defined region of DNA within a genome. Class switching, a change in the expression of the C region of an immunoglobulin heavy chain. (05 Mar 2000) |
| switching site | The break point in a DNA sequence at which a gene segment unites with another gene segment, as in the production of the immunoglobulins. (05 Mar 2000) |
| swive | To copulate with (a woman). Origin: OE. Swiven, fr. AS. Swifan. See Swivel. Source: Websters Dictionary (01 Mar 1998) |
| swivel | 1. <mechanics> A piece, as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis. 2. A small piece of ordnance, turning on a point or swivel; called also swivel gun. Swivel bridge, a kind of drawbridge that turns round on a vertical axis; a swing bridge. Swivel hook, a hook connected with the iron strap of a pulley block by a swivel joint, for readily taking the turns out of a tackle. Swivel joint, a joint, the two pieces composing which turn round, with respect to each other, on a longitudinal pin or axis, as in a chain, to prevent twisting. Origin: AS. Swifan to move quickly, to remove; akin to Icel. Sveifla to whirl, shake, svifa to ramble, to turn. See Swoop, and cf. Swift a reel, Swift. Source: Websters Dictionary (01 Mar 1998) |
| swollen belly disease | A fatal disease of infants infected with Strongyloides fuelleborni subsp. Kellyi; appears in localised areas of New Guinea. Synonym: swollen belly syndrome. (05 Mar 2000) |
| swollen belly syndrome | A fatal disease of infants infected with Strongyloides fuelleborni subsp. Kellyi; appears in localised areas of New Guinea. Synonym: swollen belly syndrome. (05 Mar 2000) |
| swollen gland | <clinical sign> Swelling of the lymph nodes. (19 Jan 1998) |
| swollen head syndrome | <syndrome> A disease of chickens caused by the turkey rhinotracheitis virus. (05 Mar 2000) |
| sword | 1. An offensive weapon, having a long and usually sharppointed blade with a cutting edge or edges. It is the general term, including the small sword, rapier, saber, scimiter, and many other varieties. 2. Hence, the emblem of judicial vengeance or punishment, or of authority and power. "He [the ruler] beareth not the sword in vain." (Rom. Xiii. 4) "She quits the balance, and resigns the sword." (Dryden) 3. Destruction by the sword, or in battle; war; dissension. "I came not to send peace, but a sword." (Matt. X. 34) 4. The military power of a country. "He hath no more authority over the sword than over the law." (Milton) 5. One of the end bars by which the lay of a hand loom is suspended. Sword arm, the right arm. Sword bayonet, a bayonet shaped somewhat like a sword, and which can be used as a sword. Sword bearer, one who carries his master's sword; an officer in London who carries a sword before the lord mayor when he goes abroad. Sword belt, a belt by which a sword is suspended, and borne at the side. Sword blade, the blade, or cutting part, of a sword. Sword cane, a cane which conceals the blade of a sword or dagger, as in a sheath. Sword dance. A dance in which swords are brandished and clashed together by the male dancers. A dance performed over swords laid on the ground, but without touching them. Sword fight, fencing; a combat or trial of skill with swords; swordplay. Sword grass. A European shrimp (Pasiphaea sivado) having a very thin, compressed body. Sword stick, a sword cane. To measure swords with one. See Measure, To put to the sword. See Put. Origin: OE. Swerd, AS. Sweord; akin to OFries. Swerd, swird, D. Zwaard, OS. Swerd, OHG. Swert, G. Schwert, Icel. Sver, Sw. Svard, Dan. Svaerd; of uncertain origin. Source: Websters Dictionary (01 Mar 1998) |
| sword-shaped | <botany> Shaped like a sword; ensiform, as the long, flat leaves of the Iris, cattail, and the like. Source: Websters Dictionary (01 Mar 1998) |
| swordbill | <ornithology> A humming bird (Docimastes ensiferus) having a very long, slender bill, exceeding the length of the body of the bird. Source: Websters Dictionary (01 Mar 1998) |