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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| the offspring of a zebra and a donkey. |
| base2 (beɪs) | |
| —adj | |
| 1. | devoid of honour or morality; ignoble; contemptible |
| 2. | of inferior quality or value |
| 3. | debased; alloyed; counterfeit: base currency |
| 4. | English history |
| 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 |
| 6. | archaic illegitimate |
| —adj, —n | |
| 7. | music an obsolete spelling of bass |
| [C14: from Old French bas, from Late Latin bassus of low height, perhaps from Greek bassōn deeper] | |
| 'basely2 | |
| —adv | |
| 'baseness2 | |
| —n | |
base (bās)
n.
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.