| thorn | <plant biology> A modified plant organ, especially a stem, that is stiffened and terminates in a sharp point. (09 Oct 1997) |
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| thorn apple | datura stramonium |
| thorn apple crystals | Ammonium urate crystal's in the shape of rounded bodies with many projecting points. (05 Mar 2000) |
| Thorn test | A putative test of adrenal cortical function; stimulation of a normally functioning adrenal cortex by the adrenocorticotrophic hormone is followed by a reduction in the number of circulating eosinophils and lymphocytes and an increase in the excretion of uric acid. The test lacks sufficient specificity and is rarely used. (05 Mar 2000) |
| Thorn's syndrome | A rare disorder resulting from renal tubular damage of a variety of aetiologies; mimics adrenocortical insufficiency in that abnormal renal loss of sodium chloride occurs, accompanied by hyponatraemia, azotemia, acidosis, dehydration, and vascular collapse. Synonym: salt-losing syndrome, Thorn's syndrome. (05 Mar 2000) |
| Thorn, George | <person> U.S. Physician, *1906. See: Thorn test, Thorn's syndrome. (05 Mar 2000) |
| thorn-headed | Having a head armed with thorns or spines. <zoology> Thorn-headed worm, any worm of the order Acanthocephala. Synonym: thornhead. Source: Websters Dictionary (01 Mar 1998) |
| thornback | 1. <zoology> A European skate (Raia clavata) having thornlike spines on its back. 2. <zoology> The large European spider crab or king crab (Maia squinado). Source: Websters Dictionary (01 Mar 1998) |
| thornbill | <ornithology> Any one of several species of small, brilliantly coloured American birds of the genus Rhamphomicron. They have a long, slender, sharp bill, and feed upon honey, insects, and the juice of the sugar cane. Source: Websters Dictionary (01 Mar 1998) |
| thornbird | <ornithology> A small South American bird (Anumbius anumbii) allied to the ovenbirds of the genus Furnarius). It builds a very large and complex nest of twigs and thorns in a bush or tree. Source: Websters Dictionary (01 Mar 1998) |
| thornbut | <zoology> The turbot. Origin: Thorn + -but as in halibut; cf. G. Dornbutt. Source: Websters Dictionary (01 Mar 1998) |
| thorntail | <zoology> A beautiful South American humming bird (Gouldia Popelairii), having the six outer tail feathers long, slender, and pointed. The head is ornamented with a long, pointed crest. Source: Websters Dictionary (01 Mar 1998) |
| Thornwaldt | Gustavus Ludwig. See: Tornwaldt. (05 Mar 2000) |
| thorny | 1. Full of thorns or spines; rough with thorns; spiny; as, a thorny wood; a thorny tree; a thorny crown. 2. Like a thorn or thorns; hence, figuratively, troublesome; vexatious; harassing; perplexing. "The thorny point of bare distress." "The steep and thorny way to heaven. <botany>" (Shak) Thorny rest-harrow, rest-harrow. Thorny trefoil, a prickly plant of the genus Fagonia (F. Cretica, etc). Origin: Cf. AS. Thorniht. Source: Websters Dictionary (01 Mar 1998) |
| but-thorn | <zoology> The common European starfish (Asterias rubens). Source: Websters Dictionary (01 Mar 1998) |
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| glasstonbury thorn | <botany> A variety of the common hawthorn. Source: Websters Dictionary (01 Mar 1998) |
| willow-thorn | <botany> A thorny European shrub (Hippophae rhamnoides) resembling a willow. Source: Websters Dictionary (01 Mar 1998) |