The plural form of the word "volcano" is "volcanoes". It follows the standard English grammar rule for forming plurals of nouns that end in o preceded by a consonant — we add "es" instead of just "s". Another example would be "hero" becoming "heroes". But not all words that end in 'o' follow this rule, like "pianos" or "photos". Language is a fascinating puzzle, isn't it? Did you encounter the word "volcano" in a particular context?
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