noun
dwarf star
Astronomical term for a star of relatively small size and low luminosity, such as the Sun.
太陽は矮星の一種である。
The Sun is a type of dwarf star.
矮星は銀河系に最も多く存在する恒星だ。
Dwarf stars are the most common type of star in the galaxy.
Compound of 矮 (wai, 'short, small') and 星 (sei, 'star'), a straightforward calque of English 'dwarf star'.