Alkali
In chemistry, an alkali (; from Arabic: al-qaly “ashes of the saltwort”) is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. An alkali also can be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The adjective alkaline is commonly, and alkalescent less often, used in English as a synonym for basic, especially for bases soluble in water. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases.
Alkali (noun)
One of a class of bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
Alkali (noun)
Soluble mineral matter, other than common salt, contained in soils of natural waters.
Base (noun)
Something from which other things extend; a foundation.
Base (noun)
The starting point of a logical deduction or thought; basis.
Base (noun)
A permanent structure for housing military personnel and material.
Base (noun)
The place where decisions for an organization are made; headquarters.
Base (noun)
A basic but essential component or ingredient.
Base (noun)
A substance used as a mordant in dyeing.
Base (noun)
Foundation: a cosmetic cream to make the face appear uniform.
Base (noun)
Any of a class of generally water-soluble compounds, having bitter taste, that turn red litmus blue, and react with acids to form salts.
Base (noun)
Important areas in games and sports.
Base (noun)
A supporting, lower or bottom component of a structure or object.
Base (noun)
A safe zone in the children’s games of tag and hide-and-go-seek.
Base (noun)
The lowermost part of a column, between the shaft and the pedestal or pavement.
Base (noun)
A nucleotide’s nucleobase in the context of a DNA or RNA biopolymer.
Base (noun)
The end of a leaf, petal or similar organ where it is attached to its support.
Base (noun)
The name of the controlling terminal of a bipolar transistor (BJT).
Base (noun)
The lowest side of a in a triangle or other polygon, or the lowest face of a cone, pyramid or other polyhedron laid flat.
Base (noun)
The lowest third of a shield or escutcheon.
Base (noun)
The lower part of the field. See escutcheon.
Base (noun)
A number raised to the power of an exponent.
“The logarithm to base 2 of 8 is 3.”
Base (noun)
synonym of radix.
Base (noun)
The set of sets from which a topology is generated.
Base (noun)
A topological space, looked at in relation to one of its covering spaces, fibrations, or bundles.
Base (noun)
In hand-to-hand balance, the person who supports the flyer; the person that remains in contact with the ground.
Base (noun)
A morpheme (or morphemes) that serves as a basic foundation on which affixes can be attached.
Base (noun)
dated form of bass
Base (noun)
The smallest kind of cannon.
Base (noun)
The housing of a horse.
Base (noun)
A kind of skirt (often of velvet or brocade, but sometimes of mailed armour) which hung from the middle to about the knees, or lower.
Base (noun)
The lower part of a robe or petticoat.
Base (noun)
An apron.
Base (noun)
A line in a survey which, being accurately determined in length and position, serves as the origin from which to compute the distances and positions of any points or objects connected with it by a system of triangles.
Base (noun)
The game of prisoners’ bars. from 15th c.
Base (verb)
To give as its foundation or starting point; to lay the foundation of.
Base (verb)
To be located (at a particular place).
Base (verb)
To act as a base; to be the person supporting the flyer.
Base (adjective)
Low in height; short.
Base (adjective)
Low in place or position.
Base (adjective)
Of low value or degree.
Base (adjective)
Of low social standing or rank; vulgar, common.
Base (adjective)
Morally reprehensible, immoral; cowardly.
Base (adjective)
Inferior; unworthy, of poor quality.
Base (adjective)
Designating those metals which are not classed as precious or noble.
Base (adjective)
Alloyed with inferior metal; debased.
“base coin”
“base bullion”
Base (adjective)
Of illegitimate birth; bastard.
Base (adjective)
Not classical or correct.
“base Latin”
Base (adjective)
obsolete form of bass
“the base tone of a violin”
Base (adjective)
Not held by honourable service.
“A base estate is one held by services not honourable, or held by villenage. Such a tenure is called base, or low, and the tenant is a base tenant.”
Alkali (noun)
a compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda
“flint is not subject to chemical weathering except by strong alkalis”
“the reaction is followed by measuring the concentration of alkali at various times”
Base (noun)
the lowest part or edge of something, especially the part on which it rests or is supported
“she sat down at the base of a tree”
Base (noun)
the part of a column between the shaft and pedestal or pavement.
Base (noun)
the end at which a part or organ is attached to the trunk or main part
“a shoot is produced at the base of the stem”
Base (noun)
a line or surface on which a figure is regarded as standing
“the base of the triangle”
Base (noun)
a known line used as a geometrical base for trigonometry.
Base (noun)
the lowest part of a shield.
Base (noun)
a conceptual structure or entity on which something draws or depends
“the town’s economic base collapsed”
Base (noun)
a foundation or starting point for further work
“she uses existing data as the base for the study”
Base (noun)
a group of people regarded as supporting an organization, for example by buying its products
“a customer base”
Base (noun)
a place used as a centre of operations by the armed forces or others; a headquarters
“he headed back to base”
Base (noun)
the main place where a person works or stays
“she makes the studio her base”
“your hotel is a good base from which to explore”
Base (noun)
a main or important element or ingredient to which other things are added
“soaps with a vegetable oil base”
Base (noun)
a substance into which a pigment is mixed to form paint, such as water, oil, or powdered aluminium hydroxide.
Base (noun)
a substance used as a foundation for make-up
“her make-up artist works with base, eye make-up, and lipstick”
Base (noun)
a substance capable of reacting with an acid to form a salt and water, or (more broadly) of accepting or neutralizing hydrogen ions.
Base (noun)
a purine or pyrimidine group in a nucleotide or nucleic acid.
Base (noun)
the middle part of a bipolar transistor, separating the emitter from the collector.
Base (noun)
the root or stem of a word or a derivative.
Base (noun)
the uninflected form of a verb.
Base (noun)
a number used as the basis of a numeration scale.
Base (noun)
a number in terms of which other numbers are expressed as logarithms.
Base (noun)
each of the four stations that must be reached in turn to score a run.
Base (verb)
use (something specified) as the foundation or starting point for something
“entitlement will be based on income”
“the film is based on a novel by Pat Conroy”
Base (verb)
situate at a specified place as the centre of operations
“a London-based band”
“the Science Policy Review Unit is based at the University of Sussex”
Base (adjective)
without moral principles; ignoble
“the electorate’s baser instincts of greed and selfishness”
Base (adjective)
denoting or befitting a person of low social class.
Base (adjective)
(of coins or other articles) not made of precious metal
“the basest coins in the purse were made in the 620s AD”