The noun 'apparatus' is an uncountable noun, it has no plural form.
The noun 'apparatus' is a type of aggregate noun, a word representing an indefinite number of elements or parts.
The singular form of feet is foot.
The singular form is hilum.
The form plumber is the singular form; the plural form is plumbers.
The singular form would be majesty.
The noun grandmother is the singular form.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The word apparatus is a noun, a common, singular, concrete noun.
The singular form is cuff.
it is already in its singular form.
"Stratum" is the singular form of stratum. The plural form is "strata".
The form hypothesis is the singular form. The plural form is hypotheses.
A singular form of dice is a die
The singular form of feet is foot.
The singular form of Oases is, Oasis.
Phenomenon is the singular form of phenomena.
The singular form of chromosomes is a chromatid.