| PLMV | posterior leaf mitral valve |
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| SB | Bachelor of Science; Schwartz-Bartter [syndrome]; serum bilirubin; shortness of breath; sick bay; si... |
| PBCO | Prudhoe Bay Crude Oil |
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| TYLCV | Tomato yellow leaf curl virus |
| bay leaf | See Bay. Source: Websters Dictionary (01 Mar 1998) |
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| cedar leaf oil | Oil obtained by steam distillation from the fresh leaves of Thuja occidentalis; used as an insect repellent and counterirritant, and in perfumery. Synonym: thuja oil. (05 Mar 2000) |
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| helminthosporium leaf spot | A plant disease affecting some grasses which is caused by parasitic fungi from the genus Helminthosporium and which appears as discoloured spots. (09 Oct 1997) |
| strip-leaf | Tobacco which has been stripped of its stalks before packing. Source: Websters Dictionary (01 Mar 1998) |
| five-leaf | Cinquefoil; five-finger. Source: Websters Dictionary (01 Mar 1998) |
| leaf | To shoot out leaves; to produce leaves; to leave; as, the trees leaf in May. Origin: OE. Leef, lef, leaf, AS. Leaf; akin to S. Lf, OFries. Laf, D. Loof foliage, G. Laub,OHG. Loub leaf, foliage, Icel. Lauf, Sw. Lof, Dan. Lov, Goth. Laufs; cf. Lith. Lapas. Cf. Lodge. 1. <botany> A coloured, usually green, expansion growing from the side of a stem or rootstock, in which the sap for the use of the plant is elaborated under the influence of light; one of the parts of a plant which collectively constitute its foliage. Such leaves usually consist of a blade, or lamina, supported upon a leafstalk or petiole, which, continued through the blade as the midrib, gives off woody ribs and veins that support the cellular texture. The petiole has usually some sort of an appendage on each side of its base, which is called the stipule. The green parenchyma of the leaf is covered with a thin epiderm pierced with closable microscopic openings, known as stomata. 2. <botany> A special organ of vegetation in the form of a lateral outgrowth from the stem, whether appearing as a part of the foliage, or as a cotyledon, a scale, a bract, a spine, or a tendril. In this view every part of a plant, except the root and the stem, is either a leaf, or is composed of leaves more or less modified and transformed. 3. Something which is like a leaf in being wide and thin and having a flat surface, or in being attached to a larger body by one edge or end; as: A part of a book or folded sheet containing two pages upon its opposite sides. A side, division, or part, that slides or is hinged, as of window shutters, folding doors, etc. The movable side of a table. A very thin plate; as, gold leaf. A portion of fat lying in a separate fold or layer. One of the teeth of a pinion, especially when small. <zoology> Leaf beetle, any beetle which feeds upon leaves; especially, any species of the family Chrysomelidae, as the potato beetle and helmet beetle. Leaf bridge, a draw-bridge having a platform or leaf which swings vertically on hinges. <botany> Leaf bud, a sawfiy. To turn over a new leaf, to make a radical change for the better in one's way of living or doing. " They were both determined to turn over a new leaf." (Richardson) Source: Websters Dictionary (01 Mar 1998) |
| leaf blight | Any of various diseases which lead to the browning and dropping of a plant's leaves. (09 Oct 1997) |
| leaf-footed | <zoology> Having leaflike expansions on the legs; said of certain insects; as, the leaf-footed bug (Leptoglossus phyllopus). Source: Websters Dictionary (01 Mar 1998) |
| leaf-nosed | <zoology> Having a leaflike membrane on the nose; said of certain bats, especially. Of the genera Phyllostoma and Rhinonycteris. See Vampire. Source: Websters Dictionary (01 Mar 1998) |
| lion's leaf | <botany> A South European plant of the genus Leontice (L. Leontopetalum), the tuberous roots of which contain so much alkali that they are sometimes used as a substitute for soap. Source: Websters Dictionary (01 Mar 1998) |
| bay | A part of a sea or lake indenting the shore line, the word is often applied to very large tracts of water around which the land forms a curve, as Hudson's Bay. (09 Oct 1997) |
| bay-antler | <zoology> The second tine of a stag's horn. See Antler. See: Bez-Antler. Source: Websters Dictionary (01 Mar 1998) |
| bay-k-8644 | <chemical> A dihydropyridine derivative, which, in contrast to nifedipine, functions as a calcium channel agonist. The compound facilitates calcium influx through partially activated voltage-dependent calcium channels, thereby causing vasoconstrictor and positive inotropic effects. It is used primarily as a research tool. Pharmacological action: calcium channel agonists. Chemical name: 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, methyl ester (12 Dec 1998) |
| bay region | <chemistry> An indentation of three fused benzene rings. A common bay region is the site on benzo(a)pyrene, an indirect carcinogen that is metabolically activated by the p-450 system at the 7,8-double bond, leading to a 7,8-oxide, which is rapidly converted to a 7,8-dihydrodiol and later epoxidated near the bay region at the 9,10-double bond. The resulting product, a diol-epoxide is a poor substrate for epoxide hydratase and is released from the mitochondria into the cell as a highly reactive electrophil, becoming an ultimate carcinogen, as it reacts with negative charges in DNA. (25 Jun 1999) |
| bay sore | Lesion of the pinna of the ear due to cutaneous leishmaniasis, usually Leishmania mexicana; seen in workers harvesting chicle plants in Central America. Synonym: bay sore. Origin: Sp. Chicle farmer, fr. Chicle, fr. Nahuatl chictli (05 Mar 2000) |
| bay tree | A species of laurel. (Laurus nobilis). Source: Websters Dictionary (01 Mar 1998) |
| bay leaf | dried leaf of the bay laurel |
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