Greek or Latin orogin

  • Some words which retain their original Greek or Latin forms make their plurals according to the rules of Greek and Latin:

    Crisis : crises, phenomenon : phenomena Erratum : errata, radius :radii Memorandum: memoranda, terminus: termini Oasis: oasesBut some follow the English rules: Dogma:dogmas, gymnasium, gymnasiums Formula: formulas (though formulae is used by scientists)