| binary star |
two stars orbiting around a common center of gravity and often appearing as one to the unaided sight or through a telescope; double star. |
| diageotropic |
of, relating to, or being a plant organ that grows at a right angle to the line of gravity. |
| diageotropism |
the tendency of certain plant organs to grow at a right angle to the line of gravity. |
| eclipsing binary |
two stars that orbit a common center of gravity and periodically move in front of each other, causing a fluctuating magnitude. |
| escape velocity |
the minimum speed by which an object can become free from the field of gravity of a planet, star, or the like. |
| g3 |
abbreviation of "gravity," or "gravities," the force by which a planet or other such body tends to draw objects toward its center. |
| galaxy |
a system of billions of stars and other matter held relatively close to each other by gravity and separated from other such systems by vast distances. [1/3 definitions] |
| geotropism |
movement or growth of a living organism in response to gravity, such as the downward growth of plant roots. |
| gravimeter |
a device for measuring the specific gravity of a solid or liquid. [1/2 definitions] |
| gravitate |
to move toward or be attracted to something by or as if by a force of gravity. |
| gravitational |
having to do with gravity, the force by which a planet or other similar body in space tends to draw objects toward its center. |
| hydrometer |
an instrument, usu. a sealed glass tube containing a graduated scale and weighted at one end, used to measure the specific gravity of liquids. |
| Isaac Newton |
an English philosopher and mathematician who formulated the laws of gravity (b.1642--d.1727). |
| levitate |
to rise and float, apparently without hindrance from the force of gravity. [1/2 definitions] |
| pendulum |
a weight suspended on a long cord, wire, or lever so as to swing back and forth under the influence of gravity. |
| power dive |
a steep downward plunge of an aircraft such as a fighter plane that is accelerated by engine power as well as gravity. |
| roller coaster |
an amusement park ride in which a small, gravity-propelled train of open cars rides rapidly up and down a curving, winding, track built on trestles. |
| solemn |
profound because of great seriousness or gravity, or because attended by high ceremony. [1/3 definitions] |
| solemnize |
to perform with dignity and gravity, as required by ritual or other convention. [1/3 definitions] |
| terminal velocity |
the highest speed reached by a falling object, when the forces of gravity and air resistance are in equilibrium. |
| tropism |
in biology, the turning or growth of an organ or organism toward or away from an external stimulus such as light, gravity, or nutrients. |