|1.||the bottom or supporting part of anything|
|2.||the fundamental or underlying principle or part, as of an idea, system, or organization; basis|
|3.||a. a centre of operations, organization, or supply: the climbers made a base at 8000 feet|
|b. (as modifier): base camp|
|4.||a centre from which military activities are coordinated|
|5.||anything from which a process, as of measurement, action, or thought, is or may be begun; starting point: the new discovery became the base for further research|
|6.||the main ingredient of a mixture: to use rice as a base in cookery|
|7.||See also Lewis base a chemical compound that combines with an acid to form a salt and water. A solution of a base in water turns litmus paper blue, produces hydroxyl ions, and has a pH greater than 7. Bases are metal oxides or hydroxides or amines|
|8.||biochem any of the nitrogen-containing constituents of nucleic acids: adenine, thymine (in DNA), uracil (in RNA), guanine, or cytosine|
|9.||a medium such as oil or water in which the pigment is dispersed in paints, inks, etc; vehicle|
|10.||the inorganic material on which the dye is absorbed in lake pigments; carrier|
|a. the part of an organ nearest to its point of attachment|
|b. the point of attachment of an organ or part|
|12.||the bottommost layer or part of anything|
|a. the lowest division of a building or structure|
|b. the lower part of a column or pier|
|14.||another word for baseline|
|15.||the lower side or face of a geometric construction|
|a. See place-value the number of distinct single-digit numbers in a counting system, and so the number represented as 10 in a place-value system: the binary system has two digits, 0 and 1, and 10 to base two represents 2|
|b. (of a logarithm or exponential) the number whose powers are expressed: since 1000 = 10³, the logarithm of 1000 to base 10 is 3|
|c. (of a mathematical structure) a substructure from which the given system can be generated|
|d. the initial instance from which a generalization is proven by mathematical induction|
|17.||logic, maths Also called: base clause the initial element of a recursive definition, that defines the first element of the infinite sequence generated thereby|
|a. a root or stem|
|b. See base component|
|19.||electronics the region in a transistor between the emitter and collector|
|20.||photog the glass, paper, or cellulose-ester film that supports the sensitized emulsion with which it is coated|
|21.||heraldry the lower part of the shield|
|22.||jewellery the quality factor used in pricing natural pearls|
|23.||a starting or finishing point in any of various games|
|24.||baseball any of the four corners of the diamond, which runners have to reach in order to score|
|25.||the main source of a certain commodity or element: a customer base; their fan base|
|26.||informal (US), (Canadian) get to first base to accomplish the first stage in a project or a series of objectives|
|27.||informal (US), (Canadian) off base wrong or badly mistaken|
|28.||touch base to make contact|
|—vb (often foll by at |
|30.||to station, post, or place (a person or oneself)|
|[C14: from Old French, from Latin basis pedestal; see |
|1.||devoid of honour or morality; ignoble; contemptible|
|2.||of inferior quality or value|
|3.||debased; alloyed; counterfeit: base currency|
|a. (of land tenure) held by villein or other ignoble service|
|b. holding land by villein or other ignoble service|
|5.||archaic born of humble parents; plebeian|
|7.||music an obsolete spelling of bass|
|[C14: from Old French bas, from Late Latin bassus of low height, perhaps from Greek bassōn deeper]|
The part of an organ nearest its point of attachment.
A fundamental ingredient; a chief constituent of a mixture.
Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
A molecular or ionic substance capable of combining with a proton to form a new substance. Also called Brønsted base.
A nitrogen-containing organic compound that combines in such a manner.
A substance that provides a pair of electrons for a covalent bond with an acid.
|base (bās) Pronunciation Key
Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.