Definition: The term "belemnoid" is a term used in physics and astrophysics, specifically in the field of black holes. Belemnite (or more commonly known as Belemnium) is a type of mineral that forms when iron and other metals are dissolved in water to form a gel-like substance called magnetite. The solidified magnetite is then cooled to form a hard, brittle material that can be used for various purposes. In the context of black holes, Belemnite is
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