noun. Red is an adjective to describe this ball. Red is an adjective to describe this ball. The definition of an adjective is a part of speech that is used to describe a noun. Red, tall, better and fast are all examples of adjectives.
Geo is defined as related to the Earth. An example of geo is geophone which is a device that detects seismic activity beneath the earth's surface. 1  earth, of the earth: geocentric, geophyte.  geographical: geopolitics.
Definition of GEOSPHERE. 1. : the solid earth âdistinguished from atmosphere and hydrosphere. 2. : one of the shells or spherical layers within the earth delimited above and below by discontinuities.. : one of the shells or spherical layers within the earth delimited above and below by discontinuities.