Grammar Tuesdays (with Joanna): Irregular Nouns, part 2

Irregular nouns, part 2

There several irregular nouns in English whose singular form ends in –um or –on. These nouns end in ‘-a’ in the plural. Take a look at the examples below:

addendum – addenda

bacterium – bacteria

curriculum – curricula

datum – data

memorandum – memoranda

medium – media

phylum – phyla

stratum – strata

phenomenon- phenomena

criterion – criteria

The plural forms of some of these nouns are more common than their singular forms. For instance, medium, bacterium, and datum are not used nearly as frequently as their plurals: media, bacteria, and data.

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