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obsidional

adjective
ob·​sid·​i·​o·​nal | \əbˈsīdē‧ənəl\

Definition of obsidional 

1 : of or relating to a siege

2 of a piece of money : issued for use during a siege obsidional coins

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History and Etymology for obsidional

Latin obsidionalis, from obsidion-, obsidio siege (from obsidēre to besiege + -ion-, -io -ion) + -alis -al

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