noun
supergiant star
Astronomical term for a very large, luminous star. Used in scientific and educational contexts.
ベテルギウスはオリオン座にある赤色超巨星です。
Betelgeuse is a red supergiant star in the constellation Orion.
矮星 means 'dwarf star', the opposite end of the stellar size spectrum.
Compound of 超 (super-) and 巨星 (giant star). A straightforward calque of the English astronomical term 'supergiant'.