| blue-eye | <zoology> The blue-cheeked honeysucker of Australia. Source: Websters Dictionary (01 Mar 1998) |
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| blue-eyed grass | <botany> A grasslike plant (Sisyrinchium anceps), with small flowers of a delicate blue colour. Source: Websters Dictionary (01 Mar 1998) |
| blue-green algae | The former name for the blue-green bacteria, now classified as Cyanobacteria. A group of prokaryotes. Synonym: Cyanobacteria. (05 May 2002) |
| blue-green bacteria | <organism> Modern term for the blue green algae, prokaryotic cells that use chlorophyll on intracytoplasmic membranes for photosynthesis. The blue green colour is due to the presence of phycobiliproteins. Found as single cells, colonies or simple filaments. In Anabaena, in which the cells are arranged as a filament, heterocysts capable of nitrogen fixation occur at regular intervals. According to the endosymbiont theory Cyanobacteria are the progenitors of chloroplasts. (18 Nov 1997) |
| blue-green bacterium | <organism> Modern term for the blue green algae, prokaryotic cells that use chlorophyll on intracytoplasmic membranes for photosynthesis. The blue green colour is due to the presence of phycobiliproteins. Found as single cells, colonies or simple filaments. In Anabaena, in which the cells are arranged as a filament, heterocysts capable of nitrogen fixation occur at regular intervals. According to the endosymbiont theory Cyanobacteria are the progenitors of chloroplasts. (18 Nov 1997) |
| blueback | <zoology> A trout (Salmo oquassa) inhabiting some of the lakes of Maine. A salmon (Oncorhynchus nerka) of the Columbia River and northward. An American river herring (Clupea aestivalis), closely allied to the alewife. Source: Websters Dictionary (01 Mar 1998) |
| bluebag | An acute inflammation of the sheep udder, usually gangrenous. Synonym: bluebag. (05 Mar 2000) |
| bluebell | <botany> A plant of the genus Campanula, especially the Campanula rotundifolia, which bears blue bell-shaped flowers; the harebell. A plant of the genus Scilla (Scilla nutans). Source: Websters Dictionary (01 Mar 1998) |
| blueberry | <botany> The berry of several species of Vaccinium, and ericaceous genus, differing from the American huckleberries in containing numerous minute seeds instead of ten nutlets. The commonest species are V. Pennsylvanicum and V. Vacillans. V. Corymbosum is the tall blueberry. Origin: Cf. Blaeberry. Source: Websters Dictionary (01 Mar 1998) |
| blueberry muffin baby | Jaundice and purpura, especially of the face in the newborn, which may result from intrauterine viral infection. (05 Mar 2000) |
| blueberry muffin sign | <radiology> Raised, purple skin lesions, dermal metastases of neuroblastoma (stage IV-S) (12 Dec 1998) |
| bluebill | <zoology> A duck of the genus Fuligula. Two American species (F. Marila and F. Affinis) are common. See Scaup duck. Source: Websters Dictionary (01 Mar 1998) |
| bluebird | <zoology> A small song bird (Sialia sialis), very common in the United States, and, in the north, one of the earliest to arrive in spring. The male is blue, with the breast reddish. It is related to the European robin. <zoology> Pairy bluebird, a brilliant Indian or East Indian bird of the genus Irena, of several species. Source: Websters Dictionary (01 Mar 1998) |
| bluebottle | 1. <botany> A plant (Centaurea cyanus) which grows in grain fields. It receives its name from its blue bottle-shaped flowers. 2. <zoology> A large and troublesome species of blowfly (Musca vomitoria). Its body is steel blue. Source: Websters Dictionary (01 Mar 1998) |
| bluebreast | <zoology> A small European bird; the blue-throated warbler. Source: Websters Dictionary (01 Mar 1998) |
| sea-blue histiocyte syndrome | <syndrome> Rare disorder consisting of splenomegaly, mild purpura secondary to thrombocytopenia, and occasionally, hepatic cirrhosis associated with the appearance of numerous histiocytes in the spleen and bone marrow which stain a sea-blue colour. It is sometimes considered a variant of niemann-pick disease. (12 Dec 1998) |
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| pyrrol blue | C4OH3ON3O6Na;an acid triarylmethane dye employed as a vital dye and as an elastin stain. Synonym: Isamine blue. (05 Mar 2000) |
| sky blue | A pigment mixture of cobaltous stannate and calcium sulfate; used biologically as an injection mass. (05 Mar 2000) |
| nevus, blue | A benign nevus, usually solitary, representing a localised proliferation of dermal melanocytes, which is manifested by a dark blue to black, moderately firm, rounded, sharply defined nodular tumour composed of spindle-shaped melanocytes with slender cytoplasmic processes, occurring often in association with melanin-laden macrophages in a sclerotic dermis. It is also called dermal melanocytoma and jadassohn-tieche nevus. (12 Dec 1998) |
| new methylene blue | A basic thiazin dye, C18H22N3SCl, used for supravital staining of reticulocytes in blood smears. (05 Mar 2000) |
| Nile blue A | A basic oxazin dye, C20H20N3OCl, used as a fat and vital stain, and in Kittrich's stain; as an indicator, it changes from blue to purplish red at pH 10 to 11. (05 Mar 2000) |
| indigo blue | Origin: F. Indigo, Sp. Indigo, indico, L. Indicum indigo, fr. Indicus Indian. See Indian. 1. A kind of deep blue, one of the seven prismatic colours. 2. <chemistry> A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper-violet luster when rubbed. Indigo does not exist in the plants as such, but is obtained by decomposition of the glycoside indican. Commercial indigo contains the essential colouring principle indigo blue or indigotine, with several other dyes; as, indigo red, indigo brown, etc, and various impurities. Indigo is insoluble in ordinary reagents, with the exception of strong sulphuric acid. <botany> Chinese indigo, the American herb Baptisia tinctoria which yields a poor quality of indigo, as do several other species of the same genus. Having the colour of, pertaining to, or derived from, indigo. <botany> Indigo berry, the gopher snake. Indigo white, a white crystalline powder obtained by reduction from indigo blue, and by oxidation easily changed back to it; called also indigogen. Indigo yellow, a substance obtained from indigo. Source: Websters Dictionary (01 Mar 1998) |
| Isamine blue | C4OH3ON3O6Na;an acid triarylmethane dye employed as a vital dye and as an elastin stain. Synonym: Isamine blue. (05 Mar 2000) |
| isosulfan blue | C27H31N2NaO6S2;a dye used as a radiographic adjunct to mark lymphatic vessels during lymphography. (05 Mar 2000) |
| thymol blue | A dye used as an acid-base indicator, with a pK value at 1.7 and another at 8.9; red at pH values below 1.2, yellow between 2.8 and 8.0, and blue above 9.6. (05 Mar 2000) |
| toluidine blue | <chemical> A thiazin dye related to methylene blue and Azure A in structure, often used for staining thick resin sections. Typically exhibits metachromasia. (18 Nov 1997) |
| toluidine blue O | A blue basic dye, C15H16N3SCl, used as an antibacterial agent, as a nuclear stain, and to stain metachromatically certain structures (e.g., the granules in mast cells which are believed to contain heparin and cartilage matrix which is rich in chondroitin sulfate), and in electrophoresis to stain RNA, RNase, and mucopolysaccharides; it also antagonises the anticoagulant action of heparin. See: tolonium chloride. (05 Mar 2000) |
| eosin-methylene blue agar | Agar composed of peptone, lactose, and sucrose and containing eosin and methylene blue, used to distinguish between lactose-fermenting and non-lactose-fermenting Gram-negative bacteria. Synonym: EMB agar. (05 Mar 2000) |
| Trypan blue | Disease caused by Trypanosoma. (18 Nov 1997) |
| turnbull's blue | <chemistry> The double cyanide of ferrous and ferric iron, a dark blue amorphous substance having a coppery luster, used in dyeing, calico printing, etc. Cf. Prussian blue, under Prussian. Source: Websters Dictionary (01 Mar 1998) |