volcanoes
n. countable A2 Elementary US //vɑɫˈkeɪnoʊz// UK //vɒlkˈeɪnəʊz// vol·ca·noes
n. mountains with an opening at the top where hot liquid rock, steam, and ash can come out.
n. plural of 'volcano'; vents in the earth's crust through which molten rock, debris, and gases are ejected.
The islands were formed by underwater volcanoes.
Scientists monitor active volcanoes for signs of seismic activity that might predict a major eruption.
The chain of volcanoes along the tectonic plate boundary creates a dramatic landscape of basaltic flows and fertile soil that supports unique local ecosystems.
Usage
The plural is spelled either 'volcanoes' or 'volcanos', though the former is more common in standard English.