Basal joint reflex

What is Basal joint reflex?

Basal joint reflex definition and meaning on Dictionary terms:
noun
the dark, dense igneous rock of a lava flow or minor intrusion, composed essentially of labradorite and pyroxene and often displaying a columnar structure.

RELATED WORDSslag, magma, ashes, scoria, obsidian, coulee

 

reference: https://www.dictionary.com/browse/basal-joint-reflex

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