Replace 'formula' by 'formulae'. Some nouns have more than one plural form with different meanings.
that govern it.
Noun (Singular) | Plural I | Meaning | Plural II | Meaning |
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Penny | Pennies | Separate coins | Pence | Collective noun |
Fish | Fish | Considered collectively | Fishes | Considered separately |
Shot | Shots | Throw, stroke or hit in certain games | Shots | Firing from the gun |
Index | Indexe | Tables of contents | Indices | Signs in algebra |
Cloth | Cloths | Pieces of cloth | Clothes | Garments |
Brother | Brothers | Sons of the same parent | Brethre | Members of a community or society |