/vɒlˈkeɪnəʊ ||; vɑlˈkeno/noun [C] (plural volcanoes;volcanos) a mountain with a hole (crater) at the top through which steam, hot melted rock (lava), fire, etc sometimes come out 火山（顶部的火山口有时喷出熔岩、火等）: an active/dormant/extinct volcano 活╱休眠╱死火山When did the volcano last erupt? 这火山上次爆发是在什么时候？ ➔volcanic /vɒlˈkænɪk ||; vɑlˈkænɪk/ adj volcanic rock/ash 火山岩╱灰