Term: black opal: a dark colored opal with internal reflections of green or red
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: barrel cactus: a cactus of the genus Ferocactus: unbranched barrel-shaped cactus having deep ribs with numerous spines and usually large funnel-shaped flowers followed by dry fruits
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: entry: an item inserted in a written record
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: prion: (microbiology) an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: safflower oil: oil from seeds of the safflower plant
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: action: the series of events that form a plot
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: nitrogenase: an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: highland fling: a vigorous Scottish reel
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: love match: a marriage for love's sake; not an arranged marriage
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: pipe bomb: a small homemade bomb usually contained in a metal pipe
Broader: relation: an abstraction belonging to or characteristic of two entities or parts together | Unrelated: paper mill: a mill where paper is manufactured