| basalioma | <tumour> Obsolete term for basal cell carcinoma. (05 Mar 2000) |
|---|---|
| basalis | Synonym: basal. Origin: L. (05 Mar 2000) |
| basaloid | Resembling that which is basal, but not necessarily basal in origin or position. (05 Mar 2000) |
| basaloid carcinoma | <tumour> A poorly differentiated squamous cell carcinoma of the anus that has some microscopic resemblance to basal cell carcinoma of the skin, but which frequently metastasizes. (05 Mar 2000) |
| basaloid cell | A cell, usually of the epidermis, resembling a basal cell. (05 Mar 2000) |
| basaloma | <tumour> Obsolete term for basal cell carcinoma. (05 Mar 2000) |
| basalt | 1. <geology> A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated. It is usually of a greenish black colour, or of some dull brown shade, or black. It constitutes immense beds in some regions, and also occurs in veins or dikes cutting through other rocks. It has often a prismatic structure as at the Giant's Causeway, in Ireland, where the columns are as regular as if the work of art. It is a very tough and heavy rock, and is one of the best materials for macadamizing roads. 2. An imitation, in pottery, of natural basalt; a kind of black porcelain. Origin: N. Basaltes (an African word), a dark and hard species of marble found in Ethiopia: cf. F. Basalte. Source: Websters Dictionary (01 Mar 1998) |
| Basan | Marianne, 20th century German physician. See: Basan's syndrome. (05 Mar 2000) |
| Basan's syndrome | <syndrome> Ectodermal dysplasia with hypotrichosis, hypohidrosis, defective teeth, and unusual dermatoglyphics. (05 Mar 2000) |
| basanite | <chemical> Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black colour. It is employed to test the purity of gold, the amount of alloy being indicated by the colour left on the stone when rubbed by the metal. Origin: L. Basanites lapis, Gr. The touchstone: cf. F. Basanite. Source: Websters Dictionary (01 Mar 1998) |
| basbleu | A bluestocking; a literary woman. Origin: F, fr. Bas stocking + bleu blue. Source: Websters Dictionary (01 Mar 1998) |
| bascule | In mechanics an apparatus on the principle of the seesaw, in which one end rises as the other falls. Bascule bridge, a counterpoise or balanced drawbridge, which is opened by sinking the counterpoise and thus lifting the footway into the air. Origin: F, a seesaw. Source: Websters Dictionary (01 Mar 1998) |
| base | <chemistry> The nonacid part of a salt, a substance that combines with acids to form salts, a substance that dissociates to give hydroxide ions in aqueous solutions, a substance whose molecule or ion can combine with a proton (hydrogen ion), a substance capable of donating a pair of electrons (to an acid) for the formation of a coordinate covalent bond. (13 Nov 1997) |
| base analogue | <biochemistry> A chemical which resembles a nucleotide base. They can substitute the Purine and pyrimidine bases that normally appear in DNA, despite minor differences in structure. May be used for inducing mutations, including point mutations. For example: 5 bromouracil can replace thymine or 2 aminopurine replace adenine. (13 Nov 1997) |
| base composition | <biochemistry> In reference to nucleic acid, the proportion of the total bases consisting of guanine plus cytosine or thymine plus adenine base pairs. Usually expressed as a guanine + cytosine (G+C) value, for example 60% G+C. (09 Oct 1997) |