PNN (English, noun)
expansion: PNN (plural PNNs or PNNe or PNNi)
Senses:
topics: astronomy
natural-sciences
glosses: Abbreviation of planetary nebula nucleus.
tags: abbreviation
alt-of
Forms:
form: PNNs
tags: plural
form: PNNe
tags: plural
form: PNNi
tags: plural