obsidional coin

[ uh b-sid-ee-uh-nl ]
/ əbˈsɪd i ə nl /

noun

Origin of obsidional coin

1800–10; < Latin obsidiōnālis of a siege, equivalent to obsid(ēre) to besiege + -iōn- -ion + -ālis -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019