Borrowing from Frenchvolcanique, from volcan; and/or directly from volcan(o) +"Ž -ic.
Volcanic Sentence Examples
The islands are, indeed, plainly volcanic in their nature.
Its fires are not volcanic, but result from the combustion of coal some distance underground, giving off much smoke and steam; geologists estimate that the burning has been going on for at least 800 years.
In connection with the volcanic districts we may mention Le Mofete, the pools of Ampsanctus, in a wooded valley S.E.
But it is notable that all recent volcanic action was confined to a wide belt parallel to the coast.
Numerous warm springs are scattered about this volcanic region.