Definitions for "Gas giants"
the name given to planets composed mainly of gas, that are huge compared to other planets. In our solar system, gas giants refer to the four large outer planets: Jupiter, Saturn, Uranus, and Neptune.
The four largest planets (Saturn, Jupiter, Uranus, and Neptune), whose atmospheres consist mainly of the gases hydrogen and helium.
largest four planets in the solar system (Jupiter, Saturn, Uranus, and Neptune) made largely of dense gaseous atmosphere.