Relating to or of the nature of a geyser; resembling or characteristic of geyser activity or geyser-formed geological features.
From geyser plus the adjectival suffix -ic, creating a scientific adjective. The -ic suffix is common in English for forming adjectives from nouns, especially in geological and scientific contexts.
Scientists love the -ic suffix for describing geological phenomena—saying something is 'geyseric' sounds technical and precise, fitting for the serious business of studying Earth's boiling hot springs!
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