| dalmania | <paleontology> A genus of trilobites, of many species, common in the Upper Silurian and Devonian rocks. Origin: From Dalman, the geologist. Source: Websters Dictionary (01 Mar 1998) |
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| dalmatian | Of or pertaining to Dalmatia. <zoology> Dalmatian dog, a carriage dog, shaped like a pointer, and having black or bluish spots on a white ground; the coach dog. Source: Websters Dictionary (01 Mar 1998) |
| dalmatic | 1. A vestment with wide sleeves, and with two stripes, worn at Mass by deacons, and by bishops at pontifical Mass; imitated from a dress originally worn in Dalmatia. 2. A robe worn on state ocasions, as by English kings at their coronation. Origin: LL. Dalmatica: cf. F. Dalmatique. Source: Websters Dictionary (01 Mar 1998) |
| Dalrymple | John, English oculist, 1804-1852. See: Dalrymple's sign. (05 Mar 2000) |
| Dalrymple's sign | <clinical sign> Retraction of the upper eyelid in Graves' disease, causing abnormal wideness of the palpebral fissure. (05 Mar 2000) |
| dalton | <unit> A unit of mass that equals the weight of a hydrogen atom, or 1.657 x10-24 grams. Named for John Dalton, an early nineteenth century British chemist who proposed the atomic theory of matter. (09 Oct 1997) |
| Dalton's law | Each gas in a mixture of gases exerts a pressure proportionate to the percentage of the gas and independent of the presence of the other gases present. Synonym: law of partial pressures. (05 Mar 2000) |
| Dalton, John | <person>English chemist, mathematician, and natural philosopher, 1766-1844. See: Dalton's law, Dalton-Henry law, daltonian, daltonism. (05 Mar 2000) |
| Dalton-Henry law | In dissolving a mixture of gases, a liquid will absorb as much of each gas in the mixture as if that were the only gas dissolved. (05 Mar 2000) |
| daltonian | 1. Attributed to or described by John Dalton. 2. Pertaining to daltonism. (05 Mar 2000) |
| daltonism | Inability to perceive or distinguish certain colours, especially. Red; colour blindness. It has various forms and degrees. So called from the chemist Dalton, who had this infirmity. Source: Websters Dictionary (01 Mar 1998) |
| dam | 1. A female parent; used of beasts, especially of quadrupeds; sometimes applied in contempt to a human mother. "Our sire and dam, now confined to horses, are a relic of this age (13th century) . . . .Dame is used of a hen; we now make a great difference between dame and dam." (T. L. K. Oliphant) "The dam runs lowing up end down, Looking the way her harmless young one went." (Shak) 2. A kind or crowned piece in the game of draughts. Origin: OE. Dame mistress, lady; also, mother, dam. See Dame. 1. A barrier to prevent the flow of a liquid; especially, a bank of earth, or wall of any kind, as of masonry or wood, built across a water course, to confine and keep back flowing water. 2. <chemistry> A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace. Dam plate, an iron plate in front of the dam, to strengthen it. Origin: Akin to OLG, D, & Dan. Dam, G. & Sw. Damm, Icel. Dammr, and AS. Fordemman to stop up, Goth. Faordammjan. Source: Websters Dictionary (01 Mar 1998) |
| dam gene | <molecular biology> A gene that codes for the synthesis of a DNA adenine methylase. (09 Oct 1997) |
| dam methylase | <enzyme> An enzyme responsible for the methylation of adenine residues in specific sequences. Synonym: deoxyadenosine methylase. (05 Mar 2000) |
| Dam methyltransferase | <enzyme> From E coli; recognises gatc sequences in E coli k12 DNA and methylates adenosine; not part of the modification system; has been sequenced Registry number: EC 2.1.1.- Synonym: eco dam methylase, p1 dam methylase, t4 dam methylase, t2 dam methylase, dam methylase, dam gene protein, k-12 DNA adenine methylase (26 Jun 1999) |