the center around which something rotates | the technical aspects of doing something |
the 2nd cervical vertebra; serves as a pivot for turning the head | device consisting of a piece of machinery; has moving parts that perform some function |
a straight line through a body or figure that satisfies certain conditions | (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes |
a group of countries in special alliance | a natural object resembling a machine in structure or function |
the main stem or central part about which plant organs or plant parts such as branches are arranged | the atomic process that occurs during a chemical reaction |