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Rule 6a
Many nouns taken from foreign languages keep their original plural form rather than adding -s. Some words accept both forms.
From Latin
Latin origin — classical plurals
1Singular
?Choose Plural
💡Meaning
✍️Erratum
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A mistake found in a printed book or document
🧪Formula
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A rule or set of steps used to solve a problem
📑Index
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A list at the back of a book showing where topics appear
📝Memorandum
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A short written note sent within an organisation
📐Radius
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The distance from the centre of a circle to its edge
🚉Terminus
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The last stop at the end of a bus or train route
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