effulgent adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

Is effulgence a noun?

a brilliant radiance; a shining forth.

Can it's be an adjective?

The possessive adjectives are my, your, his, her, its, our, their, and whose. A possessive adjective sits before a noun (or a pronoun) to show who or what owns it.