Definition of “volcano” - English Dictionary

“volcano” in British English

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volcanonoun [ C ]

uk /vɒlˈkeɪ.nəʊ/ us /vɑːlˈkeɪ.noʊ/ plural volcanoes or volcanos

B2 a mountain with a large, circular hole at the top through which lava (= hot liquid rock) gases, steam, and dust are or have been forced out:

an extinct/dormant volcano
an active volcano
Erupting volcanoes discharge massive quantities of dust into the stratosphere.

More examples

volcanic
adjective uk /vɒlˈkæn.ɪk/ us /vɑːlˈkæn.ɪk/

volcanic ash/activity/rock

(Definition of “volcano” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“volcano” in American English

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volcanonoun [ C ]

us /vɑlˈkeɪ·noʊ, vɔl-/ plural volcanoes or volcanos

a mountain made from burned materials that may throw out hot rocks and lava (= hot liquid rock) from a hole in its top

volcanic
adjective [ not gradable ] us /vɑlˈkæn·ɪk, vɔl-/

volcanic ash/rock

(Definition of “volcano” from the Cambridge Academic Content Dictionary © Cambridge University Press)