| three-day fever | Influenza-like febrile viral disease caused by several members of the bunyaviridae family and transmitted mostly by the bloodsucking sandfly phlebotomus papatasii. (12 Dec 1998) |
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| three-day measles | <disease, virology> An acute, usually benign, infectious disease caused by a togavirus and most often affecting children and nonimmune young adults, in which the virus enters the respiratory tract via droplet nuclei and spreads to the lymphatic system. It is characterised by a slight cold, sore throat and fever, followed by enlargement of the postauricular, suboccipital and cervical lymph nodes and the appearances of a fine pink rash that begins on the head and spreads to become generalised. Synonym: German measles, rubeola. Origin: L. Rubellus = reddish, ruber = red (17 Dec 1997) |
| three-dimensional diffraction pattern | <optics> The diffraction pattern (of a point source) that appears in the three-dimensional space in and near the focal plane. For an aberration-free, diffraction- limited system, the slice of the diffraction pattern in the focal plane is the Airy disk and its surrounding diffraction rings. Above and below focus, the pattern changes periodically along the axis of the light beam so that bright and dark Airy-disk-like patterns appear alternately. The axial period of repeat is spaced twice as far apart as the radial period of repeat in the Airy disk and its diffraction rings (05 Aug 1998) |
| three-dimensional record | A maxillomandibular record made at the occluding relation. (05 Mar 2000) |
| three-flowered | <botany> Bearing three flowers together, or only three flowers. Source: Websters Dictionary (01 Mar 1998) |
| three-glass test | The bladder is emptied by passing urine into a series of 3-ounce test tubes, and the contents of the first and the last are examined; the first tube contains the washings from the anterior urethra, the second, material from the bladder, and the last, material from the posterior urethra, prostate, and seminal vesicles. Synonym: Valentine's test. (05 Mar 2000) |
| three-leafed | <botany> Producing three leaves; as, three-leaved nightshade. Consisting of three distinct leaflets; having the leaflets arranged in threes. Three-leaved nightshade. See Trillium. Source: Websters Dictionary (01 Mar 1998) |
| three-leaved | <botany> Producing three leaves; as, three-leaved nightshade. Consisting of three distinct leaflets; having the leaflets arranged in threes. Three-leaved nightshade. See Trillium. Source: Websters Dictionary (01 Mar 1998) |
| three-lobed | Having three lobes. <botany> Three-lobed leaf, a leaf divided into three parts, the sinuses extending not more than half way to the middle, and either the parts of the sinuses being rounded. Source: Websters Dictionary (01 Mar 1998) |
| three-nerved | Having three nerves. <botany> Three-nerved leaf, a leaf having three distinct and prominent ribs, or nerves, extending from the base. Source: Websters Dictionary (01 Mar 1998) |
| three-parted | Divided into, or consisting of, three parts; tripartite. <botany> Three-parted leaf, a leaf divided into three parts down to the base, but not entirely separate. Source: Websters Dictionary (01 Mar 1998) |
| three-pointed | <botany> Having three acute or setigerous points; tricuspidate. Source: Websters Dictionary (01 Mar 1998) |
| three-sided | Having three sides, especially three plane sides; as, a three-sided stem, leaf, petiole, peduncle, scape, or pericarp. Source: Websters Dictionary (01 Mar 1998) |
| threonic acid | The acid derived by oxidation of the CHO group of threose to COOH; a product of the oxidation of ascorbic acid by hypoiodite. (05 Mar 2000) |
| threonine | <amino acid> The hydroxylated polar amino acid. (15 Oct 1997) |