vulˈcanism noun

1. Volcanic activity (also volˈcanism)
2. (with cap) the teaching of the Vulcanists

Vulˈcanist or Volˈcanist noun (obsolete geology)

1. A Plutonist, a follower of James Hutton (1726–97), who asserted the geological importance of subterranean heat and the igneous origin of such rocks as basalt, opp to Neptunist
2. (without cap) a vulcanologist

vulˈcanite noun

1. The harder of the two kinds of vulcanized rubber, the softer kind being called soft rubber
2. A general name for any igneous rock of fine grain-size

vulcanīˈzable or vulcanīˈsable adjective

vulcanīzāˈtion or vulcanīsāˈtion noun

vulˈcanize or vulˈcanise transitive verb

To treat (rubber, etc) with sulphur or sulphur compounds, etc to improve its strength or otherwise modify its properties

To undergo such treatment

vulcanologˈical or volcanologˈical adjective

vulcanolˈogist or volcanolˈogist noun

vulcanolˈogy noun

The scientific study of volcanoes and volcanic phenomena

vulcanized fibre noun

A fibre obtained by treating paper pulp with zinc chloride solution, used for low-voltage insulation

Vulcan's badge noun

A cuckold's horns

volcano /vol-kāˈnō/

1. A centre of eruption of subterranean matter, typically a more or less conical hill or mountain, built of ash and lava, with a central crater and pipe
2. A state of affairs, emotional condition, etc, suggestive of a volcano because an upheaval or outburst seems imminent
3. A form of firework

volcaˈnian adjective (Keats)

volcanic /vol-kanˈik/ adjective

1. Relating to, of the nature of, produced or caused by a volcano
2. Characterized by the presence of volcanoes
3. Given to sudden outbursts of emotion

volcanˈically adverb

volcanicity /-kə-nisˈi-ti/ noun

Volcanic action or phenomena

volcanism and volcanist noun (also with caps) see vulcanism and Vulcanist under Vulcan

volcanizāˈtion or volcanisāˈtion noun

volˈcanize or volˈcanise transitive verb

To subject to the action of volcanic heat

volˈcanized or volˈcanised adjective

volcanologˈical adjective

volcanolˈogist noun

A vulcanologist

volcanolˈogy noun

Vulcanology

volcanic ash or volcanic ashes see under ash¹

volcanic bomb see under bomb

volcanic dust noun

Fine particles of powdered rock blown out from a volcano

volcanic glass noun

Rock without a crystalline structure, as obsidian, pumice, etc, produced by rapid cooling of molten lava

volcanic mud or volcanic sand noun

Volcanic ash that has been deposited under water and sorted and stratified

volcanic rocks plural noun

Those formed by volcanic agency