antenna, antennae /ænˈteniː/, analysis /əˈnæləsɪs/, analyses /əˈnæləsiːz/, apparatus, apparatuses, aquarium, aquaria/aquariums, axis, axes, cactus, cacti/ˈkæktaɪ/cactuses, crisis, crises, criterion, criteria, datum, data, focus, foci/ˈfəʊkaɪ/ focuses, formula, formulae/ˈfɔːmjəliː/formulas, gladiolus /ˌɡlædiˈəʊləs/, gladioli/ˌɡlædiˈəʊlaɪ/, medium, media, millennium, millennia, phenomenon, phenomena, radius /ˈreɪdiəs/, radii /ˈreɪdiaɪ/, symposium, symposia/symposiums, stimulus, stimuli /ˈstɪmjəlaɪ/, spectrum, spectra, thesis, theses.
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singular/plural irregular
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