We found one dictionary that defines the word glowstone:

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1. glowstone: Wiktionary

Definitions from Wiktionary (glowstone) ▸ noun:  (fantasy) A luminescent stone. Opposite: obsidian ▸ Words similar to glowstone ▸ Usage examples for glowstone ▸ Idioms related to glowstone ▸ Wikipedia articles (New!) ▸ Popular adjectives describing glowstone ▸ Words that often appear near glowstone ▸ Rhymes of glowstone ▸ Invented words related to glowstone