| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a scrap or morsel of food left at a meal. |
axis1 (ˈæksɪs) ![]() | |
| —n , pl axes | |
| 1. | a real or imaginary line about which a body, such as an aircraft, can rotate or about which an object, form, composition, or geometrical construction is symmetrical |
| 2. | one of two or three reference lines used in coordinate geometry to locate a point in a plane or in space |
| 3. | anatomy Compare atlas the second cervical vertebra |
| 4. | botany the main central part of a plant, typically consisting of the stem and root, from which secondary branches and other parts develop |
| 5. | an alliance between a number of states to coordinate their foreign policy |
| 6. | optics Also called: principal axis the line of symmetry of an optical system, such as the line passing through the centre of a lens |
| 7. | geology an imaginary line along the crest of an anticline or the trough of a syncline |
| 8. | crystallog one of three lines passing through the centre of a crystal and used to characterize its symmetry |
| [C14: from Latin: axletree, earth's axis; related to Greek axōn axis] | |
axis ax·is (āk'sĭs)
n. pl. ax·es (āk'sēz')
A real or imaginary straight line about which a body or geometric object rotates or may be conceived to rotate.
A center line to which parts of a structure or body may be referred.
The second cervical vertebra. Also called epistropheus, vertebra dentata.
An artery that divides into many branches at its origin.
| axis (āk'sĭs) Pronunciation Key
Plural axes (āk'sēz')
axial adjective |
An imaginary straight line passing through the North Pole, the center of the Earth, and the South Pole. The Earth rotates around this axis.
In geometry, a straight line about which an object may rotate or that divides an object into symmetrical halves.
Note: The axis of the Earth is an imaginary line drawn through the North Pole and the South Pole.