| Sydenham's disease | A postinfectious chorea appearing several months after a streptococcal infection with subsequent rheumatic fever. The chorea typically involves the distal limbs and is associated with hypotonia and emotional lability. Improvement occurs over weeks or months and exacerbations occur without associated infection recurrence. Synonym: acute chorea, chorea minor, chorea, juvenile chorea, rheumatic chorea, Sydenham's disease. (05 Mar 2000) |
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| syderolite | A kind of Bohemian earthenware resembling the Wedgwood ware. Source: Websters Dictionary (01 Mar 1998) |
| Sydney crease | A variation of the proximal transverse palmar flexion crease that reaches the ulnar side of the palm; associated with acute lymphocytic anaemia in early childhood, rubella embryopathy, and Down's syndrome. Synonym: Sydney line. (05 Mar 2000) |
| Sydney line | A variation of the proximal transverse palmar flexion crease that reaches the ulnar side of the palm; associated with acute lymphocytic anaemia in early childhood, rubella embryopathy, and Down's syndrome. Synonym: Sydney line. (05 Mar 2000) |
| syenite | <chemical> Orig, a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite. A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elaeolite) or leucite, and is then called nephelite (elaeolite) syenite or leucite syenite. Origin: L. Syenites (sc. Lapis), from Syene, Gr. Source: Websters Dictionary (01 Mar 1998) |
| syle | <zoology> A young herring (Clupea harengus). [Also written sile] "But our folk call them syle, and nought but syle, And when they're grown, why then we call them herring." (J. Ingelow) See: Sile a young herring. Source: Websters Dictionary (01 Mar 1998) |
| syllabic speech | An abrupt utterance, each syllable being enunciated separately; noted especially in multiple sclerosis. Synonym: syllabic speech. (05 Mar 2000) |
| syllable-stumbling | A form of stuttering in which the patient halts before certain syllables that he finds difficult to enunciate. Synonym: dyssyllabia. Origin: L. Syllabe, several letters or sounds taken together (05 Mar 2000) |
| syllidian | <zoology> Any one of numerous species of marine annelids of the family Syllidae. Many of the species are phosphorescent; others are remarkable for undergoing strobilation or fission and for their polymorphism. The egg, in such species, develops into an asexual individual. When mature, a number of its posterior segments gradually develop into one or more sexual individuals which finally break away and swim free in the sea. The males, females, and neuters usually differ greatly in form and structure. Origin: From NL. Syllis, the typical genus. Source: Websters Dictionary (01 Mar 1998) |
| sylph | 1. An imaginary being inhabiting the air; a fairy. 2. A slender, graceful woman. 3. <ornithology> Any one of several species of very brilliant South American humming birds, having a very long and deeply-forked tail; as, the blue-tailed sylph (Cynanthus cyanurus). Origin: F. Sylphe, m, fr. Gr. A kind of grub, beetle, or moth; so called by Paracelsus. Source: Websters Dictionary (01 Mar 1998) |
| sylva | Origin: L. Sylva, better silva, a wood. See Silva. <botany> Same as Silva. Source: Websters Dictionary (01 Mar 1998) |
| sylvan | 1. Of or pertaining to a sylva; forestlike; hence, rural; rustic. "The traditional memory of a rural and a sylvan region . . . Is usually exact as well as tenacious." (De Quincey) 2. Abounding in forests or in trees; woody. See: Silvan. A fabled deity of the wood; a satyr; a faun; sometimes, a rustic. "Her private orchards, walled on every side, To lawless sylvans all access denied." (Pope) Origin: L. Sylvanus, better Silvanus. See Silvan. <chemistry> A liquid hydrocarbon obtained together with furfuran (tetrol) by the distillation of pine wood. Synonym: methyl tetrol, or methyl furfuran. Origin: Sylva + furfuran. Source: Websters Dictionary (01 Mar 1998) |
| sylvanite | <chemical> A mineral, a telluride of gold and silver, of a steel-gray, silver-white, or brass-yellow colour. It often occurs in implanted crystals resembling written characters, and hence is called graphic tellurium. Alternative forms: silvanite. Origin: So called from Transylvania, where it was first found. Source: Websters Dictionary (01 Mar 1998) |
| sylvanium | <chemistry> An old name for tellurium. Alternative forms: silvanium. Origin: NL, so called from Transylvania, where it was first found. Source: Websters Dictionary (01 Mar 1998) |
| sylvate | <chemistry> A salt of sylvic acid. Source: Websters Dictionary (01 Mar 1998) |