H II region (English, noun)
expansion: H II region (plural H II regions)
Senses:
topics: astronomy
natural-sciences
glosses: A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.
Forms:
form: H II regions
tags: plural
form: H_(II) region
tags: alternative
form: HII region
tags: alternative
form: H-II region
tags: alternative