Definition of Lead

Pronunciation: lĕd
lead of the ignition. When ignitiontakesplaceduring the workingstroke the correspondingdistance from the commencement of the stroke is callednegative lead.
n.1.(Chem.) One of the elements, a heavy, pliable, inelastic metal, having a bright, bluish color, but easily tarnished. It is both malleable and ductile, though with little tenacity, and is used for tubes, sheets, bullets, etc. Its specific gravity is 11.37. It is easily fusible (melting point 327.5° C), forms alloys with other metals, and is an ingredient of solder and type metal. Atomic number 82. Atomic weight, 207.2. Symbol Pb (L. Plumbum). It is chiefly obtained from the mineral galena, lead sulphide.
2.(Print.) An article made of lead or an alloy of lead
I would have the tower two stories, and goodly leads upon the top.
- Bacon
3.A small cylinder of black lead or graphite, used in pencils.
Black lead
graphite or plumbago; - so called from its leadlike appearance and streak.
Coasting lead
a sounding lead intermediate in weight between a hand lead and deep-sea lead.
Deep-sea lead
the heaviest of sounding leads, used in water exceeding a hundred fathoms in depth.
Hand lead
a small lead use for sounding in shallow water.
- Ham. Nav. Encyc.
Krems lead
a pure variety of white lead, formed into tablets, and called also Krems white, or Kremnitz white, and Vienna white.
Lead arming
tallow put in the hollow of a sounding lead. See To arm the lead (below).
Lead colic
See under Colic.
Lead color
a deep bluish gray color, like tarnished lead.
Lead glance
(Min.) Same as Galena.
Lead line
a - (Med.) A dark line along the gums produced by a deposit of metallic lead, due to lead poisoning.
b - (Naut.) A sounding line.
Lead mill
a leaden polishing wheel, used by lapidaries.
Lead ocher
(Min.) a massive sulphur-yellow oxide of lead. Same as Massicot.
Lead pencil
a pencil of which the marking material is graphite (black lead).
Lead plant
(Bot.) a low leguminous plant, genus Amorpha (Amorpha canescens), found in the Northwestern United States, where its presence is supposed to indicate lead ore.
Lead tree
a - (Bot.) A West Indian name for the tropical, leguminous tree, Leucæna glauca; - probably so called from the glaucous color of the foliage.
- Gray.
b - (Chem.) Lead crystallized in arborescent forms from a solution of some lead salt, as by suspending a strip of zinc in lead acetate.
Mock lead
a miner's term for blende.
Red lead
a scarlet, crystalline, granular powder, consisting of minium when pure, but commonly containing several of the oxides of lead. It is used as a paint or cement and also as an ingredient of flint glass.
Red lead ore
(Min.) crocoite.
Sugar of lead
acetate of lead.
To arm the lead
to fill the hollow in the bottom of a sounding lead with tallow in order to discover the nature of the bottom by the substances adhering.
To cast the lead
to cast the sounding lead for ascertaining the depth of water.
- Ham. Nav. Encyc.
White lead
hydrated carbonate of lead, obtained as a white, amorphous powder, and much used as an ingredient of white paint.
v. t.1.To cover, fill, or affect with lead; as, continuous firing leads the grooves of a rifle.
[imp. & p. p. Leaded; p. pr. & vb. n. Leading.]
2.(Print.) To place leads between the lines of; as, to lead a page; leaded matter.
1.To guide or conduct with the hand, or by means of some physical contact or connection; as, a father leads a child; a jockey leads a horse with a halter; a dog leads a blind man.
[imp. & p. p. Led (lĕd); p. pr. & vb. n. Leading.]
If a blind man lead a blind man, both fall down in the ditch.
- Wyclif (Matt. xv. 14.
They thrust him out of the city, and led him unto the brow of the hill.
- Luke iv. 29.
In thy right hand lead with thee
The mountain nymph, sweet Liberty.
- Milton.
2.To guide or conduct in a certain course, or to a certain place or end, by making the way known; to show the way, esp. by going with or going in advance of.
The Lord went before them by day in a pillar of a cloud, to lead them the way.
- Ex. xiii. 21.
He leadeth me beside the still waters.
- Ps. xxiii. 2.
This thought might lead me through the world's vain mask.
Content, though blind, had I no better guide.
- Milton.
3.To conduct or direct with authority; to have direction or charge of; as, to lead an army, an exploring party, or a search; to lead a political party.
Christ took not upon him flesh and blood that he might conquer and rule nations, lead armies, or possess places.
- South.
4.To go or to be in advance of; to precede; hence, to be foremost or chief among; as, the big sloop led the fleet of yachts; the Guards led the attack; Demosthenes leads the orators of all ages.
As Hesperus, that leads the sun his way.
- Fairfax.
And lo ! Ben Adhem's name led all the rest.
- Leigh Hunt.
5.To draw or direct by influence, whether good or bad; to prevail on; to induce; to entice; to allure; as, to lead one to espouse a righteous cause.
He was driven by the necessities of the times, more than led by his own disposition, to any rigor of actions.
- Eikon Basilike.
Silly women, laden with sins, led away by divers lusts.
- 2 Tim. iii. 6 (Rev. Ver.).
6.To guide or conduct one's self in, through, or along (a certain course); hence, to proceed in the way of; to follow the path or course of; to pass; to spend. Also, to cause (one) to proceed or follow in (a certain course).
That we may lead a quiet and peaceable life.
- 1 Tim. ii. 2.
Nor thou with shadowed hint confuse
A life that leads melodious days.
- Tennyson.
You remember . . . the life he used to lead his wife and daughter.
- Dickens.
7.(Cards & Dominoes) To begin a game, round, or trick, with; as, to lead trumps; the double five was led.
To lead astray
to guide in a wrong way, or into error; to seduce from truth or rectitude.
To lead captive
to carry or bring into captivity.
To lead the way
to show the way by going in front; to act as guide.
- Goldsmith.
v. i.1.To guide or conduct, as by accompanying, going before, showing, influencing, directing with authority, etc.; to have precedence or preëminence; to be first or chief; - used in most of the senses of lead, v. t.
2.To tend or reach in a certain direction, or to a certain place; as, the path leads to the mill; gambling leads to other vices.
The mountain foot that leads towards Mantua.
- Shak.
To lead off
to go first; to begin; as, Mickey Mantle led off in the fifth inning of the game.
n.1.The act of leading or conducting; guidance; direction; as, to take the lead; to be under the lead of another.
At the time I speak of, and having a momentary lead, . . . I am sure I did my country important service.
- Burke.
2.Precedence; advance position; also, the measure of precedence; as, the white horse had the lead; a lead of a boat's length, or of half a second.
3.(Cards & Dominoes) The act or right of playing first in a game or round; the card suit, or piece, so played; as, your partner has the lead.
4.An open way in an ice field.
5.(Mining) A lode.
6.(Naut.) The course of a rope from end to end.
7.(Steam Engine) The width of port opening which is uncovered by the valve, for the admission or release of steam, at the instant when the piston is at end of its stroke.
8.(Civil Engineering) the distance of haul, as from a cutting to an embankment.
9.(Horology) The action of a tooth, as a tooth of a wheel, in impelling another tooth or a pallet.
10.(Music.) The announcement by one voice part of a theme to be repeated by the other parts.
11.In an internal-combustion engine, the distance, measured in actual length of piston stroke or the corresponding angular displacement of the crank, of the piston from the end of the compression stroke when ignition takes place; - called in full
12.(Mach.) The excess above a right angle in the angle between two consecutive cranks, as of a compound engine, on the same shaft.
13.(Mach.) In spiral screw threads, worm wheels, or the like, the amount of advance of any point in the spiral for a complete turn.
14.(Elec.) The angle between the line joining the brushes of a continuous-current dynamo and the diameter symmetrical between the poles.
15.(Theat.) A role for a leading man or leading woman; also, one who plays such a role.
16.The first story in a newspaper or broadcast news program.
17.an electrical conductor, typically as an insulated wire or cable, connecting an electrical device to another device or to a power source, such as a conductor conveying electricity from a dynamo.
18.(Baseball) the distance a runner on base advances from one base toward the next before the pitch; as, the long lead he usually takes tends to distract the pitchers.
Lead angle
(Steam Engine) the angle which the crank maker with the line of centers, in approaching it, at the instant when the valve opens to admit steam.
Lead screw
(Mach.) the main longitudinal screw of a lathe, which gives the feed motion to the carriage.

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Lazy tongs
Le beau monde
Leach brine
Leach tub
Lead angle
Lead arming
Lead colic
Lead color
Lead glance
Lead line
Lead mill
Lead ocher
Lead pencil
Lead plant
lead plaster
Lead screw
Lead soap
lead to
Lead tree
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