A metallic element, atomic no. 82, atomic wt. 207.2. SYN: plumbum.
- l. acetate has been used as an astringent in diarrhea, and in aqueous solution as a wet dressing in certain dermatoses. SYN: sugar of l..
- black l. SYN: graphite.
- l. carbonate a heavy white powder that is insoluble in water; occasionally, it is used to relieve irritation in dermatitis, but it is used largely in the manufacture of paint and in the arts and is thus productive of l. poisoning. SYN: ceruse, white l..
- l. monoxide has been used as an ingredient in external applications such as l. plaster. SYN: l. oxide (yellow), litharge, massicot.
- l. oxide (yellow) SYN: l. monoxide.
- red l. SYN: l. tetroxide.
- red oxide of l. SYN: l. tetroxide.
- l. sulfide PbS; the native form in which l. is chiefly found. SYN: galena.
- l. tetraethyl SYN: tetraethyllead.
- l. tetroxide a bright orange-red powder that turns black when heated; used in ointments and plasters. SYN: red l., red oxide of l..
- white l. SYN: l. carbonate.

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lead 'lēd n a flexible or solid insulated conductor connected to or leading out from an electrical device (as an electroencephalograph)
lead 'led n, often attrib
1) a heavy soft malleable ductile plastic but inelastic bluish white metallic element found mostly in combination and used esp. in pipes, cable sheaths, batteries, solder, and shields against radioactivity symbol Pb see ELEMENT (table)

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Ⅰ. n.
a portion of an electrocardiographic record that is obtained from a single electrode or a combination of electrodes placed on a particular part of the body (see electrocardiogram, electrocardiography). In the conventional ECG, 12 leads are recorded. Each lead represents the electrical activity of the heart as 'viewed' from a different position on the body surface and may help to localize myocardial damage.
Ⅱ. n.
a soft bluish-grey metallic element that forms several poisonous compounds. Acute lead poisoning, which may follow inhalation of lead fumes or dust, causes abdominal pains, vomiting, and diarrhoea, with paralysis and convulsions and sometimes encephalitis. In chronic poisoning a characteristic bluish marking of the gums ('lead line') is seen and the peripheral nerves are affected; there is also anaemia. Treatment is with edetate. The use of lead in paints is now strictly controlled. Symbol: Pb.

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(Pb) (led) a soft, grayish blue metal with poisonous salts; atomic number 82, atomic weight 207.19. Excessive ingestion causes lead poisoning; see under poisoning.

Medical dictionary. 2011.

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  • Lead — (pronEng|ˈlɛd) is a main group element with a symbol Pb ( la. plumbum). Lead has the atomic number 82. Lead is a soft, malleable poor metal, also considered to be one of the heavy metals. Lead has a bluish white color when freshly cut, but… …   Wikipedia

  • Lead — (l[e^]d), n. [OE. led, leed, lead, AS. le[ a]d; akin to D. lood, MHG. l[=o]t, G. loth plummet, sounding lead, small weight, Sw. & Dan. lod. [root]123.] 1. (Chem.) One of the elements, a heavy, pliable, inelastic metal, having a bright, bluish… …   The Collaborative International Dictionary of English

  • lead — lead1 [lēd] vt. led, leading [ME leden < OE lædan, caus. of lithan, to travel, go, akin to Ger leiten: for IE base see LOAD] 1. a) to show the way to, or direct the course of, by going before or along with; conduct; guide b) to show (the way)… …   English World dictionary

  • lead — Ⅰ. lead [1] ► VERB (past and past part. led) 1) cause (a person or animal) to go with one, especially by drawing them along or by preceding them to a destination. 2) be a route or means of access: the street led into the square. 3) (lead to)… …   English terms dictionary

  • Lead — (l[=e]d), v. t. [imp. & p. p. {Led} (l[e^]d); p. pr. & vb. n. {Leading}.] [OE. leden, AS. l[=ae]dan (akin to OS. l[=e]dian, D. leiden, G. leiten, Icel. le[imac][eth]a, Sw. leda, Dan. lede), properly a causative fr. AS. li[eth]an to go; akin to… …   The Collaborative International Dictionary of English

  • Lead — Lead, n. 1. The act of leading or conducting; guidance; direction; as, to take the lead; to be under the lead of another. [1913 Webster] At the time I speak of, and having a momentary lead, . . . I am sure I did my country important service.… …   The Collaborative International Dictionary of English

  • Lead — 〈[ li:d] n. 15; Mus.〉 Führungsstimme in einer Jazzband od. Popgruppe [zu engl. lead „führen“] * * * Lead [li:d ], das; [s], s [engl. lead, zu: to lead = (an)führen]: 1. <o. Pl.> führende ↑ Stimme (3 b) in einer [Jazz]band ( …   Universal-Lexikon

  • Lead — (von engl. to lead = „(an)führen“, [liːd]) hat unterschiedliche Bedeutungen: Lead (Titularbistum) Eine Stadt in der Nähe von Rapid City, siehe Lead (South Dakota). Leadklettern; Variante des Sportkletterns Marketing / Vertrieb: Die erfolgreiche… …   Deutsch Wikipedia

  • lead — 1 vt led, lead·ing: to suggest the desired answer to (a witness) by asking leading questions lead 2 n: something serving as a tip, indication, or clue the police have only one lead in the murder investigation Merriam Webster’s Dictionary of Law.… …   Law dictionary

  • lead — lead, led Lead is the present tense of the verb meaning ‘to go in front’, ‘to take charge of’, etc., and its past form is led. A common mistake is to use lead for the past form and pronounce it led in speech, probably on the false analogy of read …   Modern English usage

  • lead — [n1] first place, supremacy advance, advantage, ahead, bulge, cutting edge*, direction, edge, example, facade, front rank, guidance, head, heavy, leadership, margin, model, over, pilot, point, precedence, primacy, principal, priority, protagonist …   New thesaurus

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