Radius.
the single form of radii is radius
The singular form of a word is the form which applies only to one object, place, concept, animal, or person. For nouns, the singular form is usually the form which does not end in S. On verbs, the singular form usually ends in an S. Of course, for many words, another word is used instead, like using they as the plural form of he or she. The word they does not end in S.
The singular noun is guess; the plural form is guesses.
The singular form for the plural noun indices is index.
The singular noun is proof.The word proof is also a verb and an adjective.
the single form of radii is radius
radius
Classically, the plural should be radii, (usually pronounced ray-dee-eye) because 'radius' is a Latin word.However, in modern English, radiuses is acceptable.
The singular form of the word flagella is flagellum.
The noun radii is already a plural. The singular is radius.
Criterion is the singular form of criteria.
The word 'duo' is the singular form; the plural form is duos.
The singular form of the word "señores" is "señor."
That is the singular form; the plural form is those.
'Jackhammer' is the singular form.
The singular form is commando.
The word dog is the singular form.