The plural form of the word 'synopsis' is 'synopses'. In English, words that originate from Greek often change their final 'is' to 'es' in the plural form. So, it's just like 'thesis' becoming 'theses' or 'basis' becoming 'bases'. They belong to a category of words in English that follow specific but different rules than the usual 's' or 'es' addition that we often see to form plurals. It adds a little twist to the English language, showing that it's not always about simply tacking on an extra letter or so.
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