noun
Astronomical term for a large planet composed mainly of hydrogen and helium, such as Jupiter or Saturn.
See also: 木星型惑星
木星は太陽系最大のガスジャイアントです。
Jupiter is the largest gas giant in the solar system.
Variant with interpunct, sometimes used for clarity.
Synonymous term meaning 'Jupiter-type planet'; slightly more formal or scientific.
Borrowed from English 'gas giant'.